Question

an angle is equal to its complement what is its measure ?

Answer 1

the measure of the angle is 45°
45°+45°=90°
90°-45°=45°

Answer 2

Let the required angle be x
Therefore,

Complement angles:-
The angles whose sum is 90 are called complementary angles

Therefore,
x + x = 90
2x = 90
x = 45

Hence,45° is the answer