Answer:
2521.5 cm²
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
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
6.2m questions
8.2m answers