Posted by Morgan on .
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?

Math 
Henry,
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.