Question

A 15 m long ladder is placed against the wall of the building. If the foot of the ladder is 12 m from the wall,
find the height at which the ladder touches the building?​

Answer 1

Answer:

$hypotenuse=15m\\base=12m\\height^{2} =hypotenuse^{2} - base^{2} \\ = 15^{2} - 12^{2} \\ =225 - 144\\ =81m$