Question

find the lateral surface area and total surface area of a cube of edge 20m

Answer 1

CSA =
$4a {}^{2}$
Where a=20m
So CSA = 1600mSq.
TSA = 6(a)^2 = 2400mSq.

Answer 2

TSA=6a^2
=6*20*20
=2400m”2
LSA = 4a"2
=4*20*20=1600m"2