Question

If a square has an area of 81
square units, how long is each side?

Answer 1

9 units

Explanation:

We know that the area of a square formula is:

`A=x^(2)`

We can substitute:

81=x²

take square root of both sides

√81=√x²

9=x

This means that each side is 9 units.

Hope this helps! :)