Question

The measure of the angle is given below. Write the measure of the complementary angle.

40^°

Answer 1

Let the measure of the complementary angle be a.

∴ 40^° + a = 90^°

∴ 40^° + a − 40^° = 90^° − 40^°   ...(Subtracting 40 from both sides)

∴ a = 50^°

Hence, the measure of the complement of an angle of measure 40^° is 50^°.