Easy
Angle which has equal value as its complementary angle is -
Explanation
Explanation
Two angles are complementary if they add up to 90°. If an angle is equal to its own complement, let the angle be x, then x + x = 90°, so 2x = 90°, giving x = 45°. So the correct answer is 45°, option (2).
PRO TIP
Re-check your working by substituting the answer back into the original question.