The measure of angle A is 70.8°. Find the measures of the complement and supplement of angle A.

We are given the angle A is 70.8 degrees

Sum of an angle and its supplement angle is 180 degrees.

let us say A' is supplementary angle of A

so we have A+A'=180

70.8+A' = 180

A'=180-70.8

So supplement angle is A'=109.2 degrees

Two angles are complementary if sum of the angle and its complement is 90 degrees.

let us say complementary angle of A is "a".

A+a = 90

70.8+a=90

a=90-70.8 = 19.2

Complementary angle of A is 19.2 degrees.