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प्रश्न
The circumference of a circle is 22 cm. Find its area.
उत्तर
Let r cm be the radius of the circle.
Now,
Circumference of the circle:
`2pi"r" = 22`
`rArr 2 xx 22/7 xx r=22`
`=>"r" = (22xx7/44) "cm"`
`=> "r" = 7/2`
Also,
Area of the circle = πr2
`= (22/7xx7/2xx7/2) "cm"^2`
`= 77/2 " cm"^2`
= 38.5 cm2
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