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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?

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?

A. 10 cm
B. 12 cm
C. 15 cm
D. 13 cm
d2 = 122 + 42 + 32 = 13