The Angles Pack

An angle is a measurement of turn.It tells us the amount of turn

from one position to another.

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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.

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

41

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!

1. 2.

3. 4.

5. 6.

7. 8.

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A

1.

Right

2.

Acute3.

Obtuse

4.

Acute5.

Obtuse

6.

Acute7.

Obtuse

8.

Obtuse

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AAnswers

1degrees Acute

5degrees Acute

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12degrees Acute

15degrees Acute


25degrees Acute

32degrees Acute



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www.teachingpacks.co.ukThank 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





Education

The Angles Pack