9.0k views
5 votes
If c and d are supplementary, and the measure of d is 45 what is the measure of c?

User Ztvmark
by
7.2k points

2 Answers

2 votes
Supplementary angles are angles whose measures added together equals 180 degrees. To get angle c, subtract 45 from 180. This gives you 135, so the measure of angle C is 135 degrees.
User Fukiyel
by
6.8k points
7 votes
The definition of supplementary is that the angles add to 180°. Hence, c + d = 180; c + 45 = 180 by substitution and finally ∡c = 135°.
User Tyhesha
by
7.2k points