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प्रश्न
Find the length of the rope by which a bull must be tethered in order that it may be able to graze an area of 2464 m2
उत्तर
If the bull is tethered by a rope then the area it can graze is a circular area of radius
= length of the rope
Area of the circle = 2464 m2
πr2 = 2464 m2
`22/7 xx "r"^2` = 2464
r2 = `2464 xx 7/22`
= 122 × 7
= 16 × 7 × 7
r2 = 42 × 72
r = 4 × 7 = 28 m
length of the rope r = 28 m
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