The length and breadth of a room are 3 m and 4 m. What is the length of the longest metallic rod that can be placed on the floor? Share with your friends Share 0 Brijendra Pal answered this Hi, The longest rod is nothing but the diagonal so here using Pythagoras theorem, AD = 3 and CD = 4 AC = AD2+CD2=32+42= 5 m 0 View Full Answer