Question

Two angles are supplementary. The first angle measures 40 . What is the measurement of the second angle?

A. 140
B. 50
C. 120
D. 60

Answer 1

supplementary = 180

180
- 40
---------
140

hence, the measure of second angle is 140 degree.

Answer 2

Supplementary means that the measures add up to be 180, so the measurement of the second angle would be 140.
Hope this helped!