Question

the diameter of the circular Park is 84 metre in order to do jogging and morning walk society people plan to construct a 3.5 m wide track outside and around it. the constructor is charging rupees 200 per metre square kindly help the society members to calculate that how much money they need to contribute jointly

Answer 1

comment if my answer is correct

Answer 2

Answer:Hi,

Let the diameter of the

circular park ( D ) = 84 m

Radius of the park ( R ) = D/2

R = 84/2 = 42 m

If the width of the path outside the

park ( w ) = 3.5 m

Radius of the outside circle (r ) = R + w

r = 42 + 3.5 = 45.5 m

Area of the path ( A ) = πr² - πR²

= π(r²- R²)

= A = π(r + R ) (r - R )

= π ( R + r ) w

= ( 22 /7 ) ( 42 + 42.5 ) ( 3.5 )

A = 929.5 m²

Cost of the paving the per square

meter = Rs 200

Cost of paving total area of the path

=200 ×929.5

= Rs 185900

I hope this helps you.

:)