A park is in the shape of a circle of diameter 7m. It is surrounded by a path of width 0.7m. find the expenditure of cementing the path at the rate of Rs 110 per sq.m.
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diameter of park is 7m
radius of park is 3.5m
width of park is 0.7m
smaller radius of park is 3.5m
and bigger radius of park is 0.7+3.4 =4.2m
area of path =area of bigger circle -area of smaller circle
=22÷7(4.2^2- 3.5 ^2)
22÷7(17.64-12.25)
=22÷7(5.39)
=22×0.77
=16.94 m^2
cost is expenditure =rate × area
=110×16.94
= Rs 1864.40
radius of park is 3.5m
width of park is 0.7m
smaller radius of park is 3.5m
and bigger radius of park is 0.7+3.4 =4.2m
area of path =area of bigger circle -area of smaller circle
=22÷7(4.2^2- 3.5 ^2)
22÷7(17.64-12.25)
=22÷7(5.39)
=22×0.77
=16.94 m^2
cost is expenditure =rate × area
=110×16.94
= Rs 1864.40
joejnj1:
Bro final ans. is ₹1863.4 not ₹1864.4
no U have the doubt u can use the calculator too
I have checked again
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