The formula is: circumference = 2 x pi x radius.
As always when you use a formula, plug in the values you know and solve for the ones you don't. So plug in 46 for the circumference and solve for the radius. (You'll get that the radius = (circumference)/(2pi)).
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circumference = pi*46 cm
If the circumference of a circle is 12 cm the radius is: 1.91 cm
A circle with a radius of 0.5 cm has a circumference of 3.14 cm.
A circle with a radius of 7.7 cm has a circumference of 48.38 cm
A circle with a radius of 208 cm has a circumference of 1306.9 cm