The formula for the circumference of a circle is C= 2πr, where ' r ' is the radius.
In order to find the value of r, divide 2π to the other side.
<em>C= 2πr</em>
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Option A is the correct answer.
So, if you have any numerical value of C(circumference ) put in the above formula by using the value of π =3.14 (approximately) and you will get the value of radius(r).