Question

A crane is being used to remove a piano from an apartment building. The apartment window is 56 feet directly above the bed of the truck. The base of the
crane is a horizontal distance of 42 feet away from the building. How many feet high must the crane extend to reach the apartment window.

(It's the paragarium theorem)

Answer 1

$a^2+b^2=c^2\\(42)^2+(56)^2=c^2\\1764+3136=c^2\\4900=c^2\\70=c$

70 feet.