Question

find the edge of a cube whose surface area is 864 cm sq

Answer 1

total surface area of a cube=6a square
therefore,864=6a square
864/6=a square
a square=144
a=root of 144
a=12 cm

Answer 2

TSA of a cube = 6a sq = 864
a square= 864/6
a sq = 144
a = 12
therefore the edge of a cube = 12 cm