The outer edge of a circular running track is 330m long. If it is widened by 7 m around, find the cost of widening it at?8 per m sq.

Outer Edge Of Park or Circumference = 330
Circumference = 2 * Pi * r
330 = 2 * 22/7 * r
330 = 44/7r
44/7r = 330
r = 330 * 7/44
r = 52.5 m

Area Of Running Track = Pi * r^2
= 22/7 x 52.5 * 52.5
= 8662.5 sq m
 Radius Of Widened Track = 52.5 + 7
= 59.5
Area = Pi * r^2
= 22/7 * 59.5 * 59.5
= 11126.5 sq m

Area Increase = 11126.5 - 8662.5
= 2464 sq m

Cost Of Widening = 8 * 2464
= 19712 Rs.
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