Question

find the angle which is equal to its complement.

Answer 1

Let the angle be a

Complement angle = 90 - a

According to question,

a = 90 - a

=> a + a = 90

=> 2a = 90

=> a = 45

Required angle = 45°

Answer 2

Let the angle be x
It's complement will also be x.
x + x = 90°
2x = 90°
So, x = 90/2
x = 45°

Angle is 45°