SOLUTION: A road 3.5m wide surrounds a circular plot whose circumference is 44 m.find the cost of paving the road at rs 50 per m sq

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Question 607454: A road 3.5m wide surrounds a circular plot whose circumference is 44 m.find the cost of paving the road at rs 50 per m sq
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A road 3.5m wide surrounds a circular plot whose circumference is 44 m.
find the cost of paving the road at rs 50 per m sq
:
Find the radius of the plot
2%2Api%2Ar = 44
:
r = 44%2F%282%2Api%29
r = 7.0 meters
:
Find the area of the plot
A = pi%2A7%5E2
A = 154 sq/m
:
Radius of the whole thing: 7 + 3.5 = 10.5 meters
Find the Area of the whole thing
A = pi%2A10.5%5E2
A = 346.36 sq/m
:
Find the area of the road only
346.36 - 154 = 192.36 sq/m
:
Find the cost of the road
192.36 * 50 = 9,618. 03 Rs