A US copper penny is exactly 2 cm wide.
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The diameter of a US penny is 0.01905 metres
The diameter of a circle that has a 33 cm circumference is: 10.5 cm (circumference divided by pi = diameter).
The diameter is 23.99 cm (circumference divided by Pi = diameter).
The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm
If the circumference is 20 cm then the diameter is 6.366 cm