the circumference of a circle is 31.4 cm find the radius and the area of the circle take pie equals to 3.14
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circumference =2 pi r=2*pi=2*3.14=6.28
circumference=31.4
=6.28r
R=31.4/6.28
R=5 cm
So area of circle =pi r ^2
=3.14*5^2
=3.14*25
=78.5 sq .cm
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