Question

A rectangular box has a square base of size `x` , a height of `h` and an open top. What is its surface area in terms of `x` and `h`?

Answer 1

`x^2+4xh`

Explanation:

The surface area (`SA`) = Lateral `SA` (`L`) =area of base (`B`)
`SA=L+B`

`B=` side squared: `B=x^2`

`L=` perimeter of base multiplied by the height: `L=4xh`

`SA=x^2+4xh`