The formula for finding the area of a square that has a side length, s, is A=s^2. If a square has an area of 40 square units, what is the length of a side?

1.) 2sqrt10

2.) 10sqrt2

3.) 20

To find the area of a square, use this formula-

A=a² where 'a' is the length of one side.

Since we know the area, and are trying to find the side length, then you would do the opposite-

a=√A

a=√40

√40≈6.32

The you would solve your other answers to compare. I started at the top, with choice one, and solved it this way-

2*√10

√10≈3.16

2*3.16≈6.32

So the answer would be choice 1, '2sqrt10'