Question

Find the side of cube whose total surface area is 486 cm2​

Answer 1

Surface Area of cube=486

6a²=486

a²=486/6

a²=81

a=√81

a=9cm

side of cube is 9 cm

Answer 2

Step-by-step explanation:

$let \: the \: side \: of \: a \: cube \: be \: a \: cm \\ as \: we \: know \: that \: total \: surface \: area \: of \: a \: cube \: with \: side \: a \: = 6 \: a {}^{2} \\ given \: total \: surface \: area \: of \: a \: cube \: is \ \: : {486}cm^{2} \\ ⟹6 {a}^{2} = 486 \\ ⟹ {a}^{2} = 81 \\ a = 9 \\ so \: the \: side \: of \: cube \: is \: 9 \: cm$

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