Oh, dude, the radius of a circle is just the distance from the center to any point on the circle. So, if you have an 8.7 cm circle, the radius is half of that, which is 4.35 cm. Like, it's just basic math, nothing too crazy.
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Well is this the circumference if it is divide 8.7cm by pie (3.14....) this will give you th diameter, then divide this by 2 and you will have the answer good luck!
If it is a 7.1 cm radius circle, then its radius is exactly 7.1 cm!
If a circle has a circumference of 16 cm then the radius is about: 2.546 cm
The area of a circle, if the radius is 5 cm, is: 78.54 cm2
That depends what you mean with "a 20 cm. circle". If 20 cm. is the radius, you already have the answer. If 20 cm. is the diameter, the radius is half the diameter. (10cm)
14 cm. In a circle, diameter is always twice the radius.