A 7m wild road run around a circular Park whose circumference is 176 m find the cost of fencing the outer boundary of the road at the rate of rupees 21 per metre
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Step-by-step explanation:
Radius of the park =r
Circumference of the park =2πr
176=2πr
r=
2π
176
r=
2×
7
22
176
r=
2×22
176×7
r=28 m
Area of road =π(28+7)
2
−π(28)
2
=π(35
2
−28
2
)
=
7
22
(35−28)(35+28)
=
7
22
×7×63
=1386 m
2
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