Active Maths 8 Each student book covers the core ...... Macmillan Macmillan Australian Curriculum...
Transcript of Active Maths 8 Each student book covers the core ...... Macmillan Macmillan Australian Curriculum...
Active Maths 8Australian Curriculum edition
www.macmillan.com.au
Macmillan Australian CurriculumMacmillan
Active Maths 8 Australian Curriculum
edition Hom
ework Program
Aust
ralia
n Cu
rric
ulum
edi
tion
Acti
ve M
Aths
Active Maths Homework Program is a topic-based homework program featuring a student book and teacher resource book at Years 7 to 10. The series has been revised to address all the content descriptions and achievement standards contained in the Mathematics Australian Curriculum.
Each student book covers the core Mathematics topics taught at that level, and incorporates skill sheets, investigations and technology tasks.
The teacher book features:££ introductory material on the topics in all books, showing alignment
with the Australian Curriculum££ simple suggestions on ways the program can be used in your school££ a quick teacher reference guide that includes a list of:− skillsheets and a breakdown of concepts covered− investigations, with descriptions and problem-solving behaviours
highlighted− technology tasks, with descriptions and details of the
technologies used in each task££ all student tasks from the student book, with answers included for
easy marking££ a simple record sheet that can be photocopied to record individual
student progress££ four certificate templates that can be photocopied and modified to
your school needs.
The program has a simple and flexible design, enabling it to successfully complement any other Mathematics resource being used. It is written by teachers for teachers, and has been successfully trialled and used throughout Australia.
8
Monique MiottoTracey MacBeth-Dunn
Homework Program
Seri
es ti
tles Active Maths 7
Australian Curriculum editionISBN 978 1 4202 3063 5
Active Maths 7 Teacher book Australian Curriculum editionISBN 978 1 4202 3064 2
Active Maths 8 Australian Curriculum editionISBN 978 1 4202 3065 9
Active Maths 8 Teacher book Australian Curriculum editionISBN 978 1 4202 3066 6
Active Maths 9 Australian Curriculum editionISBN 978 1 4202 3067 3
Active Maths 9 Teacher book Australian Curriculum editionISBN 978 1 4202 3068 0
Active Maths 10 Australian Curriculum editionISBN 978 1 4202 3069 7
Active Maths 10 Teacher book Australian Curriculum editionISBN 978 1 4202 3070 3
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Aust
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Australian CurriculumAustralian CurriculumAustralian CurriculumAustralian
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
Homework Program
888888888888
Monique Miotto
Tracey MacBeth-Dunn
Ingrid Kemp Jessica MurphyJim Spithill
Series editor and lead author
Author
Contributing authors
ACTI
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ATHS
ACTI
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ATHS
ACTI
VE M
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ACTI
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ACTI
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First published 2012 byMACMILLAN EDUCATION AUSTRALIA PTY LTD15–19 Claremont Street, South Yarra, VIC 3141
Visit our website at www.macmillan.com.au
Associated companies and representativesthroughout the world.
Copyright © Macmillan Education 2012The moral rights of the author have been asserted.
All rights reserved. Except under the conditions described in the Copyright Act 1968 of Australia (the Act) and subsequent amendments, no part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the copyright owner.
Educational institutions copying any part of this book for educational purposes under the Act must be covered by a Copyright Agency Limited (CAL) licence for educational institutionsand must have given a remuneration notice to CAL. Licence restrictions must be adhered to. For details of the CAL licence contact: Copyright Agency Limited, Level 15, 233 Castlereagh Street, Sydney, NSW 2000. Telephone: (02) 9394 7600. Facsimile: (02) 9394 7601. Email: [email protected]
Publication data
Author: Miotto, Monique and othersTitle: Active Maths 8: Homework Program (Australian Curriculum edition)ISBN: 9781420230659
Publisher: Colin McNeil and Peter SaffinProject editor: Eve SullivanEditor: Liz WaudIllustrators: Paul Lennon (cartoons). Andy Craig and Nives Porcellato (technical diagrams)Cover designer: Dim FrangoulisText designer: Sunset DigitalProduction control: Loran McDougallPermissions clearance: Elizabeth SimTypeset in Times Ten Roman 10/13pt by Sunset Digital and Nikki M Group
Printed in Malaysia
At the time of printing, the internet addresses appearing in this book were correct. Owing to the dynamic nature of the internet, however, we cannot guarantee that all these addresses will remain correct.
The author and publisher are grateful to the following for permission to reproduce copyright material:
Extract from ‘Bottled water—the facts’, Australasian Bottled Water Institute (ABWI), 2008, http://www.bottledwater.org.au. Adapted with permission from ABWI, 18; Extract from ‘Did you know—bottled water facts’, http://www.gotap.com.au, © Do Something! 2009. Adapted with permission from Do Something!,17; The Geometer’s Sketchpad® name and images used with permission of Key Curriculum Press, 1-800-995-MATH, www.keypress.com/gsp., 44, 81, 82.
The author and publisher would like to acknowledge the following:
Microsoft Excel screenshots © 2012 Microsoft Corporation. All rights reserved, 8, 9, 19, 20, 31, 51, 69, 89.
While every care has been taken to trace and acknowledge copyright, the publishers tender their apologies for any accidental infringement where copyright has proved untraceable. They would be pleased to come to a suitable arrangement with the rightful owner in each case.
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© Macmillan Education Australia 2012 Permission is granted for this page to beISBN: 978 1 4202 3065 9 photocopied by the purchasing institution.
TEACHER FEEDBACK
Skill sheet 1
Skill sheet 2
Skill sheet 3
Skill sheet 4
Investigation
Technology task
1 Algebra 1
2 Chance and data 11
3Fractions, decimals and percentages 21
4 Geometry 33
5 Indices 45
6 Integers 53
7 Linear equations and graphs 61
8 Measurement 71
9 Ratio and rates 83
Name: ....................................................... Teacher: ....................................................... Class: ...........
Record sheet
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© Macmillan Education Australia 2012 MEASUREMENT AND GEOMETRYISBN: 978 1 4202 3065 9 Geometry
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Name: .............................................................................................. Due date: .........../.........../...........
Skill sheetMacmillan Active Maths 8
Geometry 1
For 1–19, find the value of the pronumerals, giving reasons.
1
100° x
2
72° y
3
x10°
3x
4
65°
p
5 133º
70°x
6
75°40°
ba
c
7 105°
46°x
8
70°35°
q
9
h
g7 cm
10
y
x 32°z
8.6 m
11
65°
110° 115°m
12
155°y
xz
13
15°y
xz
[Find angle]
[Find angle]
[Find angle]
[Find angle]
[Find angle]
[Find angle]
[Find angle]
[Find angle]
[Triangle properties]
[Triangle properties]
[Find angle]
[Find angle in parallel lines]
[Find angle in parallel lines]
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Student comment Guardian comment/signature Teacher feedback
14
45°
p
mn
15 a
7 cm
4 cm
c
b
16
a
y
x
50°
115°
7 cm
11 cm
17
66°z
yx
18 110°
y
x
19
70°
n
m
p
For 20–24, answer true or false.
20 The diagonals of a rhombus meet at right angles.
21 The diagonals of a rectangle meet at
right angles.
22 The angles of a trapezium add up to 360°.
23 Oppositeanglesinatrapeziumare
always equal.
24 Both pairs of opposite angles in a kite
are equal.
For 25–27, find the unknown angles in the diagram below, giving reasons.
25 x =
26 y =
27 z =
For 28–30, find the value of the unknown angles in the following diagram, giving reasons.
28 a =
29 b =
30 c =
[Find angle in parallel lines]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
[Quadrilateral properties]
25°
xzy
[Find angle]
[Find angle]
[Find angle]
a
b c85°
60°
40°
[Find angle]
[Find angle]
[Find angle]
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Name: .............................................................................................. Due date: .........../.........../...........
Skill sheetMacmillan Active Maths 8
Geometry 2
For 1–3, answer true or false.
1 Congruent figures have exactly the same shape and size.
2 If two shapes are congruent then their corresponding angles will be equal.
3 If two shapes are congruent then their areas do not need to be equal.
For 4–6, are the following shapes congruent—yes or no?
4
5
6
For 7–8, find the value of x in each pair of congruent figures.
7
8
[Congruent figures]
[Congruent figures]
[Congruent figures]
[Congruent figures]
3 cm
1 cm 3 cm
1 cm
[Congruent figures]
6 cm6 cm
[Congruent figures]
70°
120° 110°
15 cm
70°
120°
15 cm
60°
[Congruent figures]
10 cm
4 cm
8 cm 7 cmx cm
[Congruent figures]
55° 77
3
3
x
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For 9–10, refer to the following diagram. The figure ABCD has undergone transformations to create the two images.
D
C
A
B
0
1
-1
-2
-3
2
3
4
5
1 2 3 4-1-2-3-4
y
x
B′
A′
D′
C′
-5 5 6 7 8
C′′
D′′B′′
A′′
9 a What transformation of ABCD produced the image A′B′C′D′?
b Is A′B′C′D′ congruent (≡) to
ABCD?
10 a State the coordinates of the following points.
A′ A″ D′ D″ b What transformation of A′B′C′D′
produced the image A″B″C″D″?
c Is A′B′C′D′ ≡ A″B″C″D″?
For 11–12, refer to the following diagram.
D
0
1
-1
2
3
4
5
1 2 3 4-1
y
x5 6 7 8
6
7
8
B
E
FA
C
11 a OnthegraphdrawthefigureABCDEF after it has been rotated 90° clockwise around A and label it A′B′C′D′E′F′.
b Is ABCDEF ≡ A′B′C′D′E′F′?
12 a Onthegridabove,drawthefinalfigure after it has been rotated 90° clockwise around A and then translated 4 units up.
b Explain why ABCDEF is congruent to A″B″C″D″E″F″.
13 Answer true or false: Performing the transformations, translation, reflection and rotation, always creates congruent figures.
14 Triangles are congruent if they satisfy one of which four tests?
15 Name the congruent triangles.
[Transformations and congruency]
[Transformations and congruency]
[Transformations and congruency]
[Transformations and congruency]
[Transformations and congruency]
[Transformations and congruency]
[Congruent triangles]
40° 7 cm
CB
A
40°
7 cm
Q
R
P
5 cm 5 cm
40°
Z
Y
X
5 cm
7 cm
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For 16–19, why are each of the pairs of triangles congruent? Use the reasons SSS, SAS, AAS and RHS.
16
17
18
19
20 Complete the proof to show that DABC is congruent to triangle DDEC.
4 cm 4 cm
2 cm 2 cm
A
B
C
D
E
In DABC and DDEC:
1 AC = (given)
2 = CE ( )
3 ∠ACB = ∠DCE ( )
\ D ≡ D (SAS)
For 21–22, refer to the following diagram.A
B DCα α
21 Complete the proof to show that triangles ACB and ACD are congruent.
In D and D :
1 ∠ACB = ∠ = 90° ( )
2 ∠ = ∠ADC ( )
3 is common
\ D ≡ D ( )
22 If AB = 10 cm and ∠BAC = 70°, complete the following.
a AD = (corresp. sides in congruent D equal)
b ∠DAC = (corresp. angles in congruent D equal)
For 23–25, refer to the following diagram.B
C
D
E
A
7 cm
5 cm8 cm
5 cm40°
75°
23 Complete the proof to show that DABC ≡ DDEC.
In D and D :
1 ∠ACB = ∠ ( )
2 ∠ = ∠CED ( )
3 = ( )
\ D ≡ D ( )
[Congruent triangles] 3 cm 5 cm
3 cm
5 cm
[Congruent triangles]
[Congruent triangles]
[Congruent triangles]
[Congruent triangle proofs]
[Congruent triangle proofs]
[Congruent triangle proofs]
[Congruent triangle proofs]
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Student comment Guardian comment/signature Teacher feedback
24 Complete the following.
a CD = (corresp. sides in ≡ D equal)
b CE = ( )
25 Complete the following.
a ∠BAC = (angle sum D)
b ∠CDE = ( )
For 26–28, refer to the following diagram.A
B D
C
26 Mark the following information onto the diagram:
∠BDA = 31°, ∠BAD = 42°, AD = CB and AB = CD
27 Complete the proofs below to show that DABD and DCDB are congruent.
In DABD and DCDB:
1 2 3 \
28 Find ∠DCB and ∠DBC, giving reasons.
29 Use a ruler and protractor to construct a triangle with angles 40° and 35° and a side 4 cm long.
30 Use a ruler and a pair of compasses to contruct a triangle with side lengths 3 cm, 5 cm, and 7 cm.
[Congruent trianges]
[Congruent trianges]
[Interpret information]
[Congruent triangles proofs]
[Congruent triangles proof]
[Construct congruent triangles]
[Construct congruent triangles]
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© Macmillan Education Australia 2012 MEASUREMENT AND GEOMETRYISBN: 978 1 4202 3065 9 Geometry
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Name: .............................................................................................. Due date: .........../.........../...........
Skill sheetMacmillan Active Maths 8
Geometry 3
For 1–5, prove that opposite sides of a parallelogram are equal.
1 OntheparallelogramABCD below draw in the diagonal AC.
B C
DA
2 Prove triangles ABC and CDA are congruent.
In DABC and DCDA:
1 ∠BCA = ∠CAD (alternate angles)
2 ∠BAC = ∠ACD(alternateangles)
3 AC is common
\ DABC ≡ DCDA (AAS)
3 AB = (corresponding sides)
BC =
4 What does this prove about the sides of
a parallelogram?
5 What does it prove about the angles in a
parallelogram?
For 6–8, prove that DEFG = DEHG.
F G
HE
6 OntherectangleEFGH above draw in the diagonal EG.
7 Label the equal sides and the right angles in the rectangle.
8 Prove DEFG ≡ DEHG.
In DEFG and DEHG:
1 FG = (given)
2 3 EG \ D
For 9–13, show that the diagonals of a rectangle are congruent.
9 Drawrectangle EFGH again, draw in diagonal FH and EG. Label the equal sides and the right angles.
F G
HE
10 Prove DEFH ≡ DHGE.
In DEFH and DHGE:
1 2 3 \ D
11 If DEFH ≡ DHGE, EG must be equal to FH because they are sides of congruent triangles.
12 The diagonals of a rectangle are
.
13 What has been proven?
For 14–21, show that the following quadrilateral has opposite sides parallel.
K L
MJ
14 OnthequadrilateralJKLM draw in the diagonal JL and label JK = LM and ∠JKL = ∠JML = 90°
[Interpret diagram]
[Congruent triangles proof]
[Interpret proof]
[Conclusion]
[Conclusion]
[Interpret diagram]
[Interpret diagram]
[Congruent triangles proof]
[Interpret diagram]
[Congruent triangles proof]
[Interpret proof]
[Interpret proof]
[Conclusion]
[Interpret diagram]
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Student comment Guardian comment/signature Teacher feedback
15 Prove that DJKL ≡ DJML.
In D D :
1 2 3 \ D
16 Mark pairs of equal angles in the congruent triangles on the diagram above.
17 ∠KJL = (corresponding angles)
\ KL is parallel to
18 ∠KLJ = (corresponding angles)
\ KL is parallel to
19 What has been proven?
20 From the given information, what type of quadrilateral is JKLM?
21 If you were also told that KL = JK, what type of quadrilateral is JKLM?
For 22–30, show that one of the diagonals of a kite bisects the other.
22 OnthekiteWXYZ below, draw in the diagonal WY.
X
W Y
Z
23 Label WX = WZ and XY = YZ.
24 Prove DWXY ≡ DWZY.
In :
1 2 3 \
25 So, ∠XWY =
26 DrawthediagonalXZ on the kite and label the point of intersection M. Label the pair of equal angles on the diagram.
27 Prove that DWXM ≡ DWZM.
In :
1 2 3 \
28 XM = (corresponding sides)
29 What has been proven?
30 ∠XMW = ∠ZMW (corresponding angles) = 90° (supplementary angles) What else does this prove about the diagonals of a kite?
[Congruent triangles proof]
[Interpret information]
[Interpret proof]
[Interpret information]
[Conclusion]
[Conclusion]
[Conclusion]
[Interpret diagram]
[Interpret information]
[Congruent triangles proof]
[Interpret proof]
[Interpret diagram]
[Congruent triangles proof]
[Interpret proof]
[Conclusion]
[Conclusion]
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© Macmillan Education Australia 2012 MEASUREMENT AND GEOMETRYISBN: 978 1 4202 3065 9 Geometry
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Name: .............................................................................................. Due date: .........../.........../...........
Macmillan Active Maths 8
Quadrilateral properties
The family of quadrilaterals includes a number of special quadrilaterals: the trapezium, the rhombus and the kite. These shapes are used in many origami designs. In this investigationyouwillusepaper-foldingtoinvestigatethespecial properties of these shapes. You will need some origami squares or A5 paper (A4 cut in half).
1 Follow the steps below to create an origami kite.
• If you need to make origami squares: Take an A5 sheet and fold the right corner down to the bottom and crease the paper. Cut the paper carefully along the edge of the fold as shown.
• Take a square and make a triangle fold, folding along one of the diagonals of the square. If you made your own squares, you will already have a folded diagonal.
• Unfold the paper. Now fold the right and left sides so that their corners meet the crease line as shown below. You now have a kite.
• Fold the kite in half along the diagonal again so that the opposite vertices meet and then unfold.
a Look at your folded kite. What is true of the length of adjacent sides?
b What is true of angles of the opposite vertices?
c If you look at the back of your kite you will see a small triangle
formed at the bottom. Fold this triangle over as shown below and then unfold. What appears to be true of the diagonals of the kite?
d How many axes of symmetry does the kite have?
[Make a model]
Investigation
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Student comment Guardian comment/signature Teacher feedback
2 To make a rhombus, start by making a kite as described previously.
• Now fold the top right edge to meet the crease in the centre as shown below. Fold the other edge in the same way. Turn over your design. You now have a rhombus.
• Fold the opposite vertices of the rhombus together as shown below, and then unfold again.
a Based on your folding of the rhombus, what is true of the lengths of its sides?
b Based on your folding of the rhombus, what is true of the opposite
angles of a rhombus?
c Dothediagonalsbisecteachother(cuteachotherinhalf)? At what angle? d How many axes of symmetry does the rhombus have? e Trueorfalse:Oppositesidesofarhombusareparallel. f Based on your answer to e, what must be true of the adjacent angles of a rhombus?
3 To make a trapezium, start by making a kite as described previously.
• Now fold the bottom vertex up as shown below. Then fold the top triangle down as before. You now have an isosceles trapezium. (Base angles are equal.)
• Fold the trapezium in half and unfold. Now fold the top right vertex down as shown below.
a True or false: A trapezium has only one pair of parallel sides. b Complete: There are pairs of supplementary angles in a trapezium.
c Drawadiagramofyourtrapeziumbelow,showingthepairsof supplementary angles.
[Make a model]
[Make a model]
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Name: .............................................................................................. Due date: .........../.........../...........
Macmillan Active Maths 8 Technology task—The Geometer’s Sketchpad
Transformations and congruence
The Geometer’s Sketchpad can be used to transform triangles and other shapes on the Cartesian plane. In this task, you will transform a triangle by reflecting, rotating and translating it and use transformations to demonstrate that two triangles are congruent.
1 Follow these steps to use Geometer’s Sketchpad to reflect, rotate and translate DABC on the Cartesian plane.
• Openanewfile,nameandsaveit.OpentheGraph menu and select Show Grid. Then select Snap Points on the Graph menu.
• Use the Line Segment tool to draw a triangle DABC with coordinates A(–8, 2), B(–6, 6), C(–2, 4). Label the points using the Text tool.
• Use the Arrow tool to click on each vertex of the triangle and then open the Construct menu and select Construct Triangle Interior.
• To reflect DABC in the y-axis,double-clickthey-axistomarkitasthemirrorline.ThenselectDABC, open the Transform menu and select Reflect. The reflected image should appear.
a What are the coordinates of the reflected image? • To rotate DABC anticlockwise about point C by 90°, click on point C to mark it as the
centreofrotation.Selectthetriangle.OpentheTransform menu and select Rotate. Check Rotate By: Fixed Angle and enter 90. Then click on Rotate.
b What are the coordinates of the rotated image? • To translate DABC +3 units horizontally and +4vertically,selectthetriangle.Openthe
Transform menu, click on Translate, check Translation Vector: Rectangular, and enter 3 for horizontal fixed distance and 4 for vertical fixed distance. (The default grid is a 1 cm grid.) Then click on Translate.
c What are the coordinates of the translated image ? DABC and its reflected, rotated and translated images are congruent triangles. Paste a copy
of your sketch in the space below.
[The default direction for rotation is anticlockwise.]
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Student comment Guardian comment/signature Teacher feedback
2 Follow these steps to demonstrate that DABC and DDEF are congruent triangles.
• OpentheFile menu and click on Document options. Click on Add Page, Duplicate: 1. This shouldcreateanewpage2inyourdocument,whichisaduplicateofthefirstpage.Onthenew page, delete the transformed images. You should be left with DABC.
• DrawatriangleDDEF with coordinates D(0, 0), E(6, –2), F(2, –4). Label the points.
• Reflect DABC in the x-axis.
• Now experiment with translating the reflected image so that it coincides with DDEF. (You should see a faint image before you click on Translate.)
• DescribethecombinationoftransformationsrequiredtodemonstratethatDABC and DDEF are congruent.
Onanewdocumentpage,useacombinationofreflectionandrotationtotransformDABC. Then select the final image and reverse the transformations to return the image to original location of DABC. Save your file.
[An image can be selected in the same way as a constructed shape.]
Try this!
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