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12. A road 3.5 m wide surrounds a circular plot whose circumference is 44 m. Find the cost of pavinroad at 20 per m1". (Take Ď =-)dosm and recast into disus ol the |
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Answer» Area of circular road =π(R^2-r^2)Given circumference=2πr=44r=7 m so, R=7+7/2=21/2 m now area of road =22/7 x {(21/2)^2-(7)^2}=22/7 x 35/2 x 7/2 =11 x 35/2 m^2cost =area x rate =11 x 35/2 x 20 =3850 Rs 3850 |
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