the inner circumference of a circular track is 220 m. the track is 7m wild everywhere. calculate the cost of putting fence along the outer circle at the rate of Rs2 per meter.
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Answer:
Inner circumference = 220
2 π r = 220
r *2* 22 = 220 * 7
r = 35 m [ inner radius ]
inner radius , r₁ = 35 m
outer radius , r₂ = 35 + 7 = 42 m
outer circumference = 2 π r ₂
= 2 * ( 22 / 7 ) * 42 = 264 m
Cost of fencing = Rs 2 * 264 = Rs 528
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