Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 5)
If a ladder leans against a wall and makes an angle of 60° with the ground, and the ladder is 10 meters long, how high up the wall does the ladder reach?
5 meters
8.66 meters
10 meters
17.32 meters
설명
Use sine: sin(60) = height/10 => height = 10*sin(60) ≈ 8.66