The unit for a circumference is the same as the unit for length (or radius or diameter).
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There is no circumference of a cone, but, we only do the circumference of the circle. the formula for the circle is pi times D. D= Diameter
Circumference of a circle is (pi * diameter). Area of a circle is (pi * r2).
A circumference is just a length, it can be in meters, feet, yards, or whatever unit you use to measure or calculate it.
Circumference = Pi * DiameterThe 3.14 is an approximation for Pi. So if you are finding the diameter of a circle, then divide the cirumference by 3.14.
Oh, dude, it's like we're back in math class! So, the formula for finding the circumference of a circle is π times the diameter. Since the diameter is 9.75, you just multiply that by π (which is approximately 3.14) and you get the circumference. So, the circumference would be around 30.63 units. Easy peasy, right?