The radius is 18.
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The circumference of a circle is equal to its diameter times pi. This is also equal to two times its radius times pi.
The circumference of a circle is equal to the radius times 2*pi. 2*pi*R where R is the radius.
Circumference = πd diameter = 2 x radius
The circumference of a circle is equal to the radius, multiplied by 2 x pi. Thus, in this case, you can divide the circumference by 2 x pi, to get the radius.
The circumference C of any circle is equal to pi*diameter. The diameter is equal to the radius times 2. So, for a circle with radius 48, it has a diameter of 96, and a circumference of 96*3.14=301.44. This of course is using 3.14 as an estimate for pi.