Shapes. Decagon A polygon having ten angles and ten sides.polygon.
Summer 2 Week 1 - The Iver Village Junior School...Summer 2 Week 1 Lesson 4 Name these shapes....
Transcript of Summer 2 Week 1 - The Iver Village Junior School...Summer 2 Week 1 Lesson 4 Name these shapes....
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Summer 2 Week 1Lesson 4
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Name these shapes.
Starter
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Name these shapes.
Rectangle
Square
Trapezoid
Decagon
Pentagon
HexagonOctagon
Parallelogram
Starter
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• Understand that there are 3 types of angles: Right angle, acute and obtuse.
• Right angles = 90˚• Acute angles = less than 90˚• Obtuse angles = more than 90˚• Be able to use angle tester to test angles.
• Angles• Right
angle• Obtuse• Acute• 90˚• Squares• Rectangles• Regular
polygons• Irregular
polygons
How can I decide if an angle is obtuse, acute or a right angle and how can I order them?
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Right Angles
Angles that are 90° are called right angles and are marked with small squares.
A right angle is formed by the intersection of 2 perpendicular lines.
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Acute Angles
Angles that are less than 90° are called acute
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Obtuse Angles
Angles that are more than 90° are called obtuse.
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Which angles are acute?
What other types of angle can you identify above?
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Which angles are acute?
What other types of angle can you identify above?
1 Obtuse angle and 2 right angles
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Look at this trapezium.What types of angles can you see inside it?
obtuse obtuse
acuteacute
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Look at this trapezium.What types of angles can you see inside it?
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Which angle is the odd one out?
Why?
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Which angle is the odd one out?
Why?
It’s the only angle that isn’t obtuse; it’s a right angle.
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Is it possible to draw a right-angled triangle
where one of the other angles is obtuse?
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The angles in a triangle always total 180 degrees. Therefore, in a right-angled triangle, the right angle is 90 degrees, making it
impossible for either angles to be obtuse.
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Which of these statements about a kite is:
a) never true?
b) always true?
c) sometimes true?
A kite has two equal angles.
A kite has four right angles.
A kite has two equal obtuse angles.
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Which of these statements about a kite is:
a) never true?
b) always true?
c) sometimes true?
A kite has two equal angles.
A kite has four right angles.
A kite has two equal obtuse angles.
always true
never true
sometimes true
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A right angle is 90°.An obtuse angle is greater than 90° but smaller than 180°.An acute angle is smaller than 90°.
Using these facts, what is the smallest number of degrees you could add to 45° to make an obtuse angle? How do you know?
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A right angle is 90°.An obtuse angle is greater than 90° but smaller than 180°.An acute angle is smaller than 90°.
Using these facts, what is the smallest number of degrees you could add to 45° to make an obtuse angle? How do you know?
46 ° The smallest obtuse angle must be 91 ° and 45 + 46
= 91 °.
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Use the greater than and less than symbols to compare these angles:
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Use the greater than and less than symbols to compare these angles:
<
<
>
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Which angle is the odd one out?
Explain your choice.
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Which angle is the odd one out?
The rest are obtuse angles
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TasksHard Harder
Label angels Label and order angles sheet
Hardest Herculean
Label and order angles sheet Label and order angles sheet