Question

The two angles on this straight line add up to 180°. Find the size, in degrees (°),

of the larger angle.
x+130°
x+20

Answer 1

145°

Explanation:

The two angles on this straight line add up to 180°. Find the size, in degrees (°),

of the larger angle.

x+130°

x+20

1) find x with an equation

180 = x + 130 + x + 20

180 - 130 - 20 = 2x

30 = 2x

x = 30 : 2

x = 15°

2) find the larger angle

x + 130 =

15 + 130 =

145°