There is a circular track with outet radius 10.5m and inner radius 7 m a)the cost of levelling the track at rupees 24 per metre square
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let levelling
=πR²-πr²
=π(R+r)(R-r)
=22/7(10.5+7)(10.5-7)
=22/7(17.5)(3.5)
=192.5
=πR²-πr²
=π(R+r)(R-r)
=22/7(10.5+7)(10.5-7)
=22/7(17.5)(3.5)
=192.5
rashishah2016:
i think answer is Rs 4620
i forget to multiply 192.5*24=4620
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