Find the length of longest rod that can be placed in a roomof dimensions 12m x 9m x 8m.
longest rod = diagonal of cuboid
= √( l2+b2+h2)
=√(122 + 92 + 82 )
=√( 144+81+64)
=√(289)
=17
hence,longest rod that can be placed in a room of dimensions 12m x 9m x 8m is 17 m