A.THE LENGTH OF ONE SIDE OF A SQUARE IS EQUAL TO THE SQUARE ROOT O...

13. a.The length of one side of a square is equal to the square root of the area of the square. Since the areaof the squares is 9, 16, and 25, the lengths of the sides of the squares are 3, 4, and 5, respectively. Thetriangle is formed by the sides of the three squares; therefore, the perimeter, or distance around the tri-angle, is 3 + 4 + 5 = 12.