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Q . 5 part { B }
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Step-by-step explanation:
inner circumference =2πr
176=2πr
r=176*7/2*22
r=28m
radius of outer track
R=28+7=35m
area of path=π(R²-r²)
a=22/7*(35²-28²)
a=22/7*441
a=1386m²
b) circumference of outer circle =2πR
=2*22/7*35
=220m
cost=220*12=rupees2640
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Hence Cost of putting up a fence along the outer circle at the rate of rs 12 per metre is Rs.2640
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