Area of a triangle (1) - stphilipneriprimary.org€¦ · 5 Draw a triangle that has 2an area of...

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1 Complete the sentences to describe the triangle. The triangle has full squares. The triangle has half squares. The area of the triangle is cm 2 2 Count squares to work out the area of each triangle. a) c) b) 3 Count squares to estimate the area of each triangle. a) c) b) Why are your answers estimates? 4 a) Work out the areas of the shapes by counting squares. b) What do you notice about your answers to part a)? Explore this using other rectangles. c) Write your findings. Area of a triangle (1) © White Rose Maths 2019 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm d) 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm

Transcript of Area of a triangle (1) - stphilipneriprimary.org€¦ · 5 Draw a triangle that has 2an area of...

Page 1: Area of a triangle (1) - stphilipneriprimary.org€¦ · 5 Draw a triangle that has 2an area of approximately 15 cm Compare answers with a partner. 6 Do you agree with Eva’s estimate?

1 Completethesentencestodescribe

thetriangle.

Thetrianglehas fullsquares.

Thetrianglehas halfsquares.

Theareaofthetriangle

is cm2

2 Countsquarestoworkouttheareaofeachtriangle.

a) c)

b)

3 Countsquarestoestimatetheareaofeachtriangle.

a) c)

b)

Whyareyouranswersestimates?

4 a)Workouttheareasoftheshapesbycountingsquares.

b) Whatdoyounoticeaboutyouranswerstoparta)?

Explorethisusingotherrectangles.

c) Writeyourfindings.

Areaofa triangle (1)

©WhiteRoseMaths2019

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1cm

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1cm

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1cm

d) 1cm

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Page 2: Area of a triangle (1) - stphilipneriprimary.org€¦ · 5 Draw a triangle that has 2an area of approximately 15 cm Compare answers with a partner. 6 Do you agree with Eva’s estimate?

5 Drawatrianglethathasanareaofapproximately15cm2

Compareanswerswithapartner.

6

DoyouagreewithEva’sestimate?

Talkaboutitwithapartner.

7 Drawtriangleswiththeseareas.

1cm22cm23cm24cm25cm26cm2

Talktoapartneraboutthebeststrategiesfordrawingthetriangles.

Areaofa triangle (1)

©WhiteRoseMaths2019

1cm

1cm

I estimate the size of the triangle to be about 16 cm2

3 Countsquarestoestimatetheareaofeachtriangle.

a) c)

b)

Whyareyouranswersestimates?

4 a)Workouttheareasoftheshapesbycountingsquares.

b) Whatdoyounoticeaboutyouranswerstoparta)?

Explorethisusingotherrectangles.

c) Writeyourfindings.

1cm

1cm

1cm

1cm

1cm

1cm

1cm

1cm

1cm

1cm


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