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?  Select
A) 19  B) 81  C) 12  D) 13  E) 17
d2 = 122 + 42 + 32   = 13   Answer:13
<result>D</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?