Answer:
16.6 feets .
Explanation:
Length of wire = 30 feets
Distance between base of tree and ground = 25 feets
Height of tree, h
Using Pythagoras rule :
h² = 30² - 25²
h² = 900 - 625
h² = 275
h = sqrt(275)
h = 16.583
h = 16.6 feets
Height of tree is 16.6 feets