A circular park of 28 m diameter has been constructed. A 3.5m circular track outside has been developed along the park. Using algebric formulae, find the area of the track around the park.

Answer 1

subtract area of inside circle from area of outside circle

radius inside = 28/2 = 14
radius outside = 14+3.5 = 17.5

so
pi(17.5^2-14^2)

Answer 2

Subtract area of inside circle from area of outside circle