Radius = circumference/pi
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Circumference of a circle: 2 x pi x radius.
to find the raduis of any circle, divde the diameter by 2. in this case, the answer would be 3.50
The perimeter of a circle is called the circumferenceTo find the circumference of a circle you do 2 times pi times radiusC = 2 * 3.14159 * 7 = 43.98inchesSince this is a half circle you have to take half of the circumference...you answer is 21.99inches
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
find the radius of a circle with circumference of 42.1