Outer edge of circular running track is 440 m long. if it is widened by 5 m all around, find cost of widening it at rate of rupees 8 per m²
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Perimeter of track = 2πr
2πr = 440m
440 × 7
= 76m
Radius of road= 70+ 5 = 75m
Area of road = πr²
22 = x 75 x 75
7
= 17678.57m²
Area of track=πr² 22 7 × 70 × 70m²
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= 220 × 70m² = 15400m²
Area of widening road= Area of road - Area of
track
= 17678.57 - 15400
= 2278.57m²
1m² costs =Rs. 8/
2278.57 costs =Rs. 8 x 2278.57/
=Rs. 18228.56.
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