Question

the inner circumference of a circular track is 220 m. the track is 7 m wide everywhere .calculate the cost of putting fence along a outer circle at rate of Rs2 per metre​

Answer 1

Let the inner radii of a circular track is r metre and

outer radii be R metre respectively, then

Inner circumference = 220 m

=>

2π = 220 m

220 2元 T=

220x7 Y =

r = 35 m

Therefore, outer radius (R) = (r + 7)m

= (35 + 7) m

And,

= 42 m

Outer circumference = 2nR

= (2x2²/×42)m

= (12 x 22) m

Hence,

= 264 m Total cost of fencing along the outer circle

= Rs. (264 x 2)

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= Rs. 4528.

Hope it helps you ☺️❤️