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The sun of length, breadth and depth of a cuboid is 19 cm and its diagonal is 5 √ 5 cm. Its surface area is?

Correct Answer: 236 cm2

Explanation:

∵ l + b + h = 19
and l2 + b2 + h2 = (5√5)2 = 125
∵ (l + b + h)2 = (19)2
⇒ (l2 + b2+ h2) + 2(lb + bh + lh) = 361
⇒ 2 (lb + bh + lh) = (361 - 125) = 236
∴ Surface area = 236 cm2


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