I'm not sure what you mean. If the radius is 5, the circumference is 10pi. (about 31 and a half) If the circumference is 5, the radius is 5 divided by 2pi. (about four fifths)
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The circumference of a circle with an 8 cm radius is: 50.27 cm
The circumference of a circle with a radius of 8.5 cm is: 53.41 cm (radius x 2 x Pi = circumference).
The radius of the circle is: 9.549 cm
If the radius of a circle is 15 cm, the circumference is: 94.2 cm
The circumference of a circle with radius of 10cm is: 62.83 cm