the sum of length,breadth and height of cuboid is 19cm and length of its diagonal is 11cm. find the total surface area of cuboid
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√(a²+b²+c²)=11
a+b+c=19
(a+b+c)²= a²+b²+c²+2ab+2bc+2ca
sa=2ab+2bc+2ca=19²-11²=[19-11][19+11]=8*30=240m²
a+b+c=19
(a+b+c)²= a²+b²+c²+2ab+2bc+2ca
sa=2ab+2bc+2ca=19²-11²=[19-11][19+11]=8*30=240m²
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