What is the length of the longest pole which can be kept in a room 12 m long, 4 m broad and 3 m high?  Choose the correct choice from the following answers: A) 16 B) 4 C) 11 D) 12 E) 13
d^2 = 12^2+4^2+3^2   d^2 = 122 + 42 + 32 = 13   Answer: 13
<result>E</result>
What is the length of the longest pole which can be kept in a room 12 m long, 4 m broad and 3 m high?