Finding the Side Length of a Square

In a classroom, there is a poster of a rectangle alongside a square. The rectangle has a length of 10 units and a width of 5 units. The square has sides of equal length. If the area of the square is equal to the area of the rectangle, what is the length of one side of the square?

To find the area of a rectangle, use the formula: $$ ext{Area} = ext{length} imes ext{width}$$

To find the area of a square, use the formula: $$ ext{Area} = ext{side}^2$$