Types of Angles Wednesday, 10 April 2019

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

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

Angles between 180 and 360 are called Reflex angles

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

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

Example Measure each of the following angles a) b)

c) d)

e) f)

g) h)

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

b) Angle B = 55 A B

c) Angle P = 105 P Q

d) Angle Y = 147 X Y

e) Angle D = 73 D E