No. The diameter is twice the radius. The circumference is equal to the diameter multiplied by pi (3.142). So the diameter is just under 1/3 of the circumference.
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Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.
If the circumference is 38, the diameter is 38/pi. Since the radius is half of the diameter, the radius is 19/pi.
Divide the circumference by the number pi, which is approximately 3.14.
It is half the circle's circumference plus its diameter.
The circumference is ALL the way around the circle, while the radius is only HALF way into the middle of the circle. I'm guessing you meant "What is the relationship between the radius of a circle and its circumference?" Radius is half of the diameter of a circle, circumference is PI times diameter; therefore, the circumference is PI times two times radius.