Question

The inner circumference of a circular track is 264 m and the width of the track is
7 m. Find :
(i) the radius of the inner track.
(ii) the radius of the outer circumference.
(iii) the length of the outer circumference.
(iv) the cost of fencing the outer circumference at the rate of 50 per m.​

Answer 1

Inner circumference of circular track = 264 m

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(I) Inner radius: r = C/2n

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= 264 x 7/2 x 22 = 1848​/44 = 42 cm

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(II) Width of track = 7m

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Side note: Outer radius R = 42 + 7 = 49 m

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(III) Outer circumference: 2nr = 2 x 22/7 x 49 = 308

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(IV) Rate of fencing: 50 Rs per meter

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Possible answer: Total cost of fencing outer circumference = 50 x 308 = Rs. 15400.

Hope this helps! It might not be right.