The sum of length,breadth and depth of a cubood is 9cm and the length of its diagonal is 11cm. Find the surface area of cuboid
littyissacpe8b60:
are you sure it is 9?
not 19?
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Surface area SA = 2(lb + lh + bh)
l + b + h = 9cm
Lenth of the diognal = 11
√l² + b² + h² = 11
l ² + b² + h² = 11² = 121
(l + b + h)² = l² + b² + h² + 2(lb + lh + bh)
9² = 121 + 2(lb + lh + bh)
81 - 121 = 2(lb+lh+bh)
Surface area = -40cm²
I am getting minus numbers. So pls check the question whether it is 19 or 9 or some other number
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