A man standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 60°. When he retreats 20 m from the bank, he finds the angle to be 30°. What is the breadth of the river?
Q1. A man standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 60°. When he retreats 20 m from the bank, he finds the angle to be 30°. What is the breadth of the river?
Answer: 10 m
Explanation: Using the tangent function, we can form two equations based on the given angles and the distance retreated, and solve for the breadth of the river.