Question

The measures of the angles of a triangle are shown in the figure below. Solve for x.

Answer 1

54 + 90 = 144
180 - 144 = 36
36°

Answer 2

x = 39°

Explanation:

51° + 90° = 141°

180° - 141° = x

x = 39°

They often don't label the 90° angle, so watch out for that in the future