Question

A cube has a side length of 20.5 cm .what is the surface area of the cube?

Answer 1

Answer:

2521.5 cm²

Step-by-step explanation:

A cube has 6 equal, square sides.

If the side length is 20.5 cm, then the area of one side is (20.5 cm)², or 420.25 cm².

The total surface area of the cube is thus 6(420.25 cm²) = 2521.5 cm²

Answer 2

To sum up, we only have the length of one side.

We need to find the width of the same side. -

20.5 x 20.5 = 420.25

To get the surface area, we multiply by six.

Why? There are six sides on a cube.

420.25 x 6 = 2521.5

Answer: 2521.5 cm