the sum of length , breadth and height of a cuboid is 21 cm and the length of its diagonal is 13 cm . find TSA of cuboid
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diagonal = √l²+b²+h² = 13
⇒l²+b²+h² = 13² = 169
l+b+h=21
⇒(l+b+h)²=21² = 441
⇒l²+b²+h²+2(lb+bh+lh)=441
⇒169 + total surface area = 441
⇒ TSA = 441-169 = 272 cm²
cost = 272×1.40 = Rs. 380.8
⇒l²+b²+h² = 13² = 169
l+b+h=21
⇒(l+b+h)²=21² = 441
⇒l²+b²+h²+2(lb+bh+lh)=441
⇒169 + total surface area = 441
⇒ TSA = 441-169 = 272 cm²
cost = 272×1.40 = Rs. 380.8
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