Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 8 - No. 4)
Which of the following statements are true about angles of elevation and depression?
The angle of elevation is the angle formed by a line of sight above the horizontal.
The angle of depression is the angle formed by a line of sight below the horizontal.
The angle of elevation is always greater than the angle of depression.
The angle of elevation is equal to the angle of depression, assuming parallel lines.
설명
The definitions of the angles and the properties of parallel lines make these statements true.