The diameter of a circular park is 84 m. A 3.5 m wide road runs on the

1.	The diameter of a circular park is 84 m. A 3.5 m wide road runs on the out side aroundif find the cost of constructing the road at Rs 20 per cm2
Answer» Area of circular park = pirr Given r = 84/2 = 42 m Area of circular park Ap= 22/74242= 22642 Area of park including road Ar= 22/745.545.5= 226.545.5 Area of road = Ap - Ar= 22(6.545.5 - 642)= 22(295.75 - 252)= 2243.5= 957 m^2 or 9570000 cm^2 Cost of constructing the road = 957000020= Rs 1,91,400,000

The diameter of a circular park is 84 m. A 3.5 m wide road runs on the out side aroundif find the cost of constructing the road at Rs 20 per cm2

Answer»

Area of circular park = pi*r*r

Given r = 84/2 = 42 m

Area of circular park Ap= 22/7*42*42= 22*6*42

Area of park including road Ar= 22/7*45.5*45.5= 22*6.5*45.5

Area of road = Ap - Ar= 22(6.5*45.5 - 6*42)= 22(295.75 - 252)= 22*43.5= 957 m^2 or 9570000 cm^2

Cost of constructing the road = 9570000*20= Rs 1,91,400,000