Question

the radius of a circular field is 70 m .on its outside there is path 7m wide.find the cost levelling the path at 2.50 per square m.
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Answer 1

Answer:

For inside distance :

Radius = 70 m

Circumference = 2πr = 440 m

For outside distance :

Radius = 70 + 7 = 77 m

Circumference = 2πr = 484 m

Total length = 440 + 484 = 924 m

cost = 2.50 × 924 = ₹2310

Answer 2

Answer:

inner radius = 70 m

area = πr^2

= 22/7 × 70×70

= 15400 m^2

outer radius =70+7=77

area=22/7×77×77

=18634 m^2

:. area of the path = 18634 - 15400

=3234 m^2

:. cost of levelling = 2.5× 3234

= 8085 ruppee