Question

Find the side of a cube if its total surface area is 486 CM square

Answer 1

total surface area = 486
6(a^2) = 486
a^2 = 81
a = 9
now, side of a cube is 9 cm

Answer 2

Let side be x

T.S.A = 6x²

486 = 6x²

81 = x²

±9 = x

Since side can't be negative
so , side of cube is 9