Math
posted by Morgan .
Cody has a circular fish pond with a diameter of 6.4 feet around which he wants to put a sidewalk. He has enough concrete left over to cover an area of 65 square feet. Assuming the sidewalk is of uniform width, how wide can the sidewalk around the pond be?

As = pi*r^2 = 65 Ft^2.=Area of sidewalk.
r^2 = 20.69
r2 = 4.55 Ft. = Radius of sidewalk.
r1 = 6.4/2 = 3.2 Ft. = radius of pond.
W = r2  r1 = 4.55  3.2 = 1.35 Ft. =
Width of sidewalk.