Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 27)
What is the relationship between the angle of elevation and the angle of depression, assuming the horizontal lines are parallel?
They are supplementary.
They are complementary.
They are equal.
They are unrelated.
Explication
The angle of elevation equals the angle of depression, assuming parallel horizontal lines.