Teach your children about angles with our enormous resource pack! Includes child-friendly teaching and reference materials, engaging activities and eye-catching display resources to use on your Maths display boards. Available to download from http://www.teachingpacks.co.uk/the-angles-pack/

1. An angle is a measurement of turn.
It tells us the amount of turn
from one position to another.
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2. Some angles have special names
that you need to remember.
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Whole Turn
(360º)
Straight Line
(or straight angle)
(180º)
Right Angle
(90º)
Acute Angle
(less than 90º)
Obtuse Angle
(between 90º and 180º)
Reflex Angle
(more than 180º)
You can use these to estimate the size of unknown angles.

3. We can use a protractor to measure the size of an angle.
It can be helpful to make a sensible estimate first.
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32
4
1
2
3
4
This angle is acute. My estimate is 70º.
Place the cross of the protractor on top
of the corner of the angle.
Line up the bottom line of the protractor
with one of the lines of the angle.
Starting at 0º, count up to the angle’s
other line and read the measurement.
This angle is 67º.
Did you notice that the protractor has two scales?
Remember to start counting at the correct 0º.
When you are
reading the
measurement,
check that your
protractor
hasn’t moved!

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The angles inside a triangle always add up to 180º.
70o
70o
40o
60o90o
30o
30o
107o
43o
40o
+70o
+70o
=180o
30o
+90o
+60o
=180o
30o
+107o
+43o
=180o
If you know two of the angles inside a triangle,
you can use this fact to calculate the third angle...
... and if the triangle is an isosceles triangle, you can
calculate the other angles if you only know one of them!

5. 1. 2.
3. 4.
5. 6.
7. 8.
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A

6. 1.
Right
2.
Acute
3.
Obtuse
4.
Acute
5.
Obtuse
6.
Acute
7.
Obtuse
8.
Obtuse
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A
Answers

7. 1
degrees
Acute
5
degrees
Acute
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8. 12
degrees
Acute
15
degrees
Acute
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9. 25
degrees
Acute
32
degrees
Acute
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Thank you for looking at this preview
of our Angles Pack.
The full pack includes many other
teaching, activity and display
resources. Download it from
http://www.teachingpacks.co.uk/
the-angles-pack/
Helen and Mark