Question

10. A cube has edge length c. (a) Write a formula for the surface area of the cube. (b) Use the formula to find the surface area when c is 6 cm.​

Answer 1

a)
`6c^2`

b) 216 cm^2

Explanation:

A) the area of one face of the cube, is the side length x the side length. As it is a cube, all sides are the same length, so we do c x c =
`c^2`

There are 6 faces in a cube so we have to times one face by 6 to get
`6c^2`

B) c = 6

substituting this into the equation we made:

6 x (6)^2

6 x 36

216

So the surface area is 216 cm^2.

Hope this helps, let me know if you have any questions :)