Question

A firefighter places a 29 feet ladder, so that the base of the ladder is 21 feet from the wall. What is the height at which the top of the ladder touches the wall?

Answer 1

From the right angled triangle,we can say,

`A^2 + B^2 = C^2`

or, `A = sqrt(C^2 - B^2) = sqrt(400) =20 ft`