Question

a circular pond is 17.5 m of diameter. it is surrouned by a 2m wide park .find the cost of constructing the park at the rate of 25rs per meter square

Answer 1

Answer:

Rs.3061.5

Step-by-step explanation:

Diameter of circular pond = 17.5 m

Radius of circular pond = 17.5/2= 8.75 m

Since we are given that  it is surrounded by a 2m wide park .

So, outer radius = 8.75+2 = 10.75 m

Area of park = Outer area - inner area

                   =πR^2-πr^2

                   =3.14(10.75^2-8.75^2)

                   =122.46 sq.m.

Cost of constructing park 1 sq.m. = Rs.25

Cost of constructing park 122.46 sq.m.= 25*122.46 =Rs.3061.5

Hence  the cost of constructing the park at the rate of 25rs per meter square is Rs.3061.5