Question

Find the surface area of a cube with edges 6.39 cm long.

Answer 1

1) The surface of a cube is found by calculating the surface of 6 squares,

then we have this formula (Considering a cube as a hexaedron):

S=6a²

2) Since the edges are 6.39, then

S= 6 (6.39)²

S= 244.9926

Then

S = 245 cm²