.A circular grass plot of land, 42m in diameter, has a path 3.5 m wide running round it on the outside. Find the cost of gravelling the path at Rs. 4 per square metre.
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Answer
Rs.2002
Step by step explaination
radius of plot =42/2
= 21
Radius of plot with path = 21 + 3.5
= 24.5m
Area of plot = π(R ^2 - r^2)
= 22/7 (24.5 ^2 - 21^2)
= 22/7 (600.25-441)
=500.5m^2
Cost of gravelling = Rs.(500.5×4)
= Rs.2002
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