Question

find the surface area of cubes with edges of the following lengths.
a) 7.5 cm
b) 10 cm

Answer 1

a)
$surface \: area \: of \: cube \: = 6 {a}^{2} \\ = 6 \times 7.5 \times 7.5 \\ = 337.5 {cm}^{2}$
b)surface area of cube=6×10×10
=600sq.cm
I hope it helps you

Answer 2

Surface area of cube = 6 ×a×a
1. SA = 6×7.5×7.5
= 337.5
2. SA = 6×10×10
= 600

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