Math- How to find the height of the monkey in the tree

A monkey is sitting at the top of a tree in a zoo. A girl wants to take a picture that captures the monkey and all of the tree in the scene too. She backs away 50 feet from the tree making her angle of elevation 60º. Based on her angle and distance, how high is the monkey in the tree?
Tan 60º= 1.732

Multiply 1.72 by 50 to get the adjacent/the height of the tree