The area of the green square is 9 ft2. The area of the red square is 16 ft2. whats the length of side c?

.

To do this, divide the total square footage by its square root. The square root of 9 is 3. 9 divided by 3 is 3. All sides of the green square are 3 ft in length. The square root of 16 is 4. 16 divided by 4 is 4. All the sides of the red square are 4 ft in length.