The inner circumference of a circular track [Fig. 3] is 220 m. The tra

1.	The inner circumference of a circular track [Fig. 3] is 220 m. The track is 7 m wide everywhenCalculate the cost of putting up a fence along the outer circle at the rate of 2 per metre.21.e everywhere7 cmFig. 3
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

The inner circumference of a circular track [Fig. 3] is 220 m. The track is 7 m wide everywhenCalculate the cost of putting up a fence along the outer circle at the rate of 2 per metre.21.e everywhere7 cmFig. 3

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