Question

Please help, i don't want to fail this..

The measure of angle Y is 45°, and the measure of angle Z is 70°.

A triangle has angles X, Y, Z. The exterior angle to angle X is W.

What is the measure of angle W?
25°
65°
115°
120°

Answer 1

First get X. All the angles of a triangle added up are always 180.
So
180 = X + Y + X
180 = X + 45 + 70
180 - 115 = 65 = X
Exterior angle plus interior angle is also always 180
So
180 - X
180 - 65
W = 115

Answer 2

115

Explanation:

1. 45 + 70 = 115
2. 180 - 115 = 65 (X = 65°)
3. 180 - 65 = 115 ( W = 115°)

Hope this helps :)