The formula for calculating the circumference of a circle is 2*pi*radius. The radius is half of the diameter, so if the diameter is 34 inches, then the radius is 17. So we have two times pi times seventeen, which gives us 34 pi. If you need a more specific number, multiply 34 by 3.14. You get 106.76 inches.
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16 cm
Multiply the diameter by 3.14 (pi).
Circumference of circle: 5.5 times pi
yes the radius is half the diameter. It goes from the edge of the circle to the centre.
Divide the diameter by 2. (The radius is 1/2 of the diameter.)