Question

find the length of the longest rod that can be placed in a room 12 m long ,9m broad and 8m high.

Answer 1

Length of the longest rod = $\sqrt{ l^{2} + b^{2} + h^{2} }$
=$\sqrt{ 12^{2} + 9^{2} + 8^{2} }$
= $\sqrt{144+81+64}$
= $\sqrt{289}$
= 17cm