Outer radius of road = R

Inner radius of road = r

Width of park road = d

R = 2 + d

Circumference of road (outer) = 2πR

2πR = 352 [from problem given]

Inner radius = R – d = 56 – 7 = 49 m

Area of road = (area of circle with radius 56m) – (area of circle with radius 49m)