Question

A ladder is placed against a wall of the building 15 m above the ground .the foot of the ladder is 8 m away from the bottom of the wall find the length of the ladder

Answer 1

By Pythagoras theorem
h^2=p^2+b^2
h^2=20^2+8^2
h^2=400+64
h^2=464
h=root 464
h=21.54 m