Acircular garden is bordered by a walkway. the radius of the garden is 6 feet, and the walkway is 2 1/2 feet wide. rose wants to put a fence around the garden, between the garden and the walkway. how many feet of fencing will she need to buy? c= πd π= 22/7

a.) 6^2 π
b.) 6 π
c.) 8 1/2 π
d.) (8 1/2)^2 π
e.) none of the above