Posted by Katherine on Wednesday, March 17, 2010 at 7:57pm.
a worker in a city parks need to cover a circular path around the outside of a flower garden with gravel. the radius of the garden is 15 feet and the path surrounding the garden is 6 feet wide. how many square feet need to be covered with gravel? expalin how you arrived at your answer

math  Ms. Sue, Wednesday, March 17, 2010 at 8:05pm
You need to find the area of both circles. Then subtract the area of the inner circle from the outer circle.
A = pi * r^2
A = 3.14 * 15^2
A = 3.14 * 225
A = 706.5 square feet
A = 3.14 * 21^2
A = 3.14 * 441
A = 1384.74 square feet
1384.74  706.5 = ?