A person standing on the bank of a river observes the angle of elevation of the top of a tree on the opposite bank as 60°. When he moves 20 m away, the angle becomes 30°. What is the height of the tree?
Q1. A person standing on the bank of a river observes the angle of elevation of the top of a tree on the opposite bank as 60°. When he moves 20 m away, the angle becomes 30°. What is the height of the tree?
Answer: 10√3 m
Explanation: Using trigonometric relations for the two positions, we can find the height of the tree.