The diameter of a circle is twice its radius and spans the circle passing through its centre.
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Yes it is, two radii make up the dimater of a circle. :)
Diameter of the circle: 31.4/pi = 10 miles rounded up
Diameter = 58/pi which is about 18.462 cm rounded up.
Since you didn't provide a number, I'll make one up. A circle with a circumference of 35 m has a diameter of approximately 11 m.
Radius is the distance from the outside of the circle to the center. Diameter is the distance ACROSS the circle, it's formula is: D = 2R (Diameter is 2 times the Radius) Circumference is the distance AROUND the circle. C = Pi D, where Pi is the constant 3.1415.... (look it up))