Question

10 M wide path is made outside of a circular Park the diameter of the park is 22 M find the cost of constructing the park at rupees 10 m square

Answer 1

A 3 m wide path runs outside and around a rectangular park of length 125 m and ... of width 2.25 m is constructed all along outside a room which is 5.5 m long and 4 m wide. Find

Answer 2

Here if you clearly observe the diagram [when you make make the diagram of it]
then you will find that it forms a ring
and the area of the that ring will be
π(R^2 - r^2)
Here R is outer radius and r is inner radius

we have inner radius(r) = 22/2 = 11m
but what about outer radius

so the outer radius is equal to the inner radius + width of the road
so R = 11 + 10 = 21m

now the area of that road will be

π(R^2 - r^3)
π[ (21)^2 -(11)^2]
1005.31 m^2. [ Direct calculated from calculator]

if the cost of constructing road is rupees 10 per m^2
so for 1005.31 m^2 it should be equal to

10 × 1005.31
=rupees 1005.31