1. Types of Angles
Wednesday, 10 April 2019

2. Angles are usually measured in degrees.
Angles between 0 and 90 are called Acute angles
An Angle of 90 is called a Right-angle

3. Angles between 90 and 180 are called Obtuse angles
An Angle of 180 is called a Straight-angle (straight line)

4. Angles between 180 and 360 are called Reflex angles

5. Example
Name each of the following angles
(a) (b) (c)
(d) (e) (f)

6. The protractor
Definition: A protractor is a semi-circular or circular tool than can be used to measure the size of an angle.

7. Example
Measure each of the following angles a) b)

8. c) d)

9. e) f)

10. g) h)

11. Example
Draw each of the following angles
a) Angle A = 30 A B

12. b) Angle B = 55 A B

13. c) Angle P = 105 P Q

14. d) Angle Y = 147 X Y

15. e) Angle D = 73 D E