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प्रश्न
The radius of a circular garden is 56 m. What would it cost to put a 4-round fence around this garden at a rate of 40 rupees per metre?
उत्तर
Radius of the circular garden, r = 56 m
Circumference of the circular garden, c = 2πr
= `2xx22/7xx56`
= 352 m
∴ Length of the wire needed for one round of fencing
= c = 352 m
Cost of one round of fencing = length of wire × cost per metre
= 352 × 40
= 14080 rupees
Cost of four round of fencing
= 4 × 14080
= 56320 rupees
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