The supplement of an angle is 3 times the complement of an angle.

Let's says that x is the measure of the angle. X and it's supplement are equal to 180. X and it's complement are equal to 90. The supplement is s and the complement is c. S is times c which is the same as 3c.

3c + x = 180

C+x = 90

X = 90 - c

3c + 90 - c = 180

2c = 90

C = 45

The complement of. 45 degree angle is 45 degrees.

The angle is 45 degrees.