Question

the total surface area of cube is 486 cm find the edge of cube

Answer 1

total surface area of square is given by
$6 {a}^{2} = 486 \\ {a}^{2} = 486 \div 6 \\ {a}^{2} = 81 \\ a = ( + - )9$
since length can't be negative hence
a=9
that is edge length =9 cm
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Answer 2

TSA of cube=6a^2
6a^2=486
a^2=81
a=9cm
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