Question

A 7m road runs along a circular park of radius 49m. Find area of road.​

Answer 1

Area of circular park with road

A1 = πR²

A1 = π(49+7)²

A1 = 22/7 × 3136

A1 = 448 × 22

A1 = 9856m²

Area of circular park without road,

A2 = πr²

A2 = π × (49)²

A2 = 22/7 × 2401

A2 = 22 × 343

A2 = 7546m²

Area of road = A1–A2

Area of road = 9856–7546

Area of road = 2310m²