Question

1) In the diagram, l || m. If the measure of angle 3 is 120 find the measure of the following angles

a) angle 4

b) angle 6

c) angle 8

Answer 1

a) angle 4 = 60°

b) angle 6 = 120°

c) angle 8 = 60°

Explanation:

a) angle 4 =

• angle 3 and angle 4 are on the straight angle and they are both equal 180°

angle 3 = 120

angle 4 = 180 - 120 = 60

a) angle 4 = 60°

b) angle 6 =

• angle 6 = angle 2 and angle 2 = 120°

b) angle 6 = 120°

c) angle 8 =

• angle 6 and angle 8 are on the straight angle and they are both equal 180°

angle 8 = 180 - 120 = 60

• angle 8 = angle 4 and angle 4 = 60°

c) angle 8 = 60°