Assuming you are talking about a circle, you simply multiply the diameter by pi. Keep the result (in this case) as 65pi to have it exact, or use an approximation of pi such as 3.1416, and do the multiplication, if you want an actual number.
Circumference of the circle: 65*pi = 204.204 cm rounded to 3 decimal places
204.2 cm, approx.
The diameter of a circle that has a 33 cm circumference is: 10.5 cm (circumference divided by pi = diameter).
The circumference of a circle with a diameter of 14cm is: 43.98 cm
The diameter is 23.99 cm (circumference divided by Pi = diameter).
The circumference of circle that is 8 cm is: about 25.13 cm (diameter x pi = circumference).
The circumference of a circle with an 81.6 cm diameter is: 256.4 cm
The diameter of a circle when the circumference is 35 cm is: 11.14 cm (circumference divided by Pi = diameter).
The diameter of a circle that has a 33 cm circumference is: 10.5 cm (circumference divided by pi = diameter).
The circumference of a circle with the diameter of 2.7 cm is 8.5 cm
The circumference of a circle with a diameter of 12 cm is: about 37.7 cm
The diameter of a circle with a circumference of 45 cm is: about 14.32 cm
If the circumference of a circle is 30 cm its diameter is: 9.549 cm
The circumference of a circle with a diameter of 1.3 cm is 4.08 cm
Diameter in cm = circumference/pi
A circle with a diameter of 7.5 cm has a circumference of: 23.56 cm
If the circumference of a circle is 48 cm its diameter is: 15.28 cm
The circumference of a circle if the diameter is 1 cm will be Pi (about 3.1416).
Circumference of a circle in cm = diameter*pi or 2*pi*radius