The circumference of a 6 cm diameter circle is: about 18.85 cm. You can easily do this calculation for other circles by multiplying the diameter by Pi (about 3.1416).
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If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).
Since circumference equals pi times the diameter, if the diameter of a circle is 6, then its circumference is going to be pi times 6 or 6 pi.
Oh, dude, you're mixing up your shapes there! Circles don't have perimeters because they're all curvy and stuff. But if you want to know the circumference of a circle with a 12 cm diameter, you just use the formula Circumference = π x Diameter, so it would be 12π cm. But, like, who really cares about circles anyway, right?
The circumference of a 6 foot diameter circle is: 18.8 feet. (C = d x Pi)
They would have to give you enough information to eventually get the diameter. If they gave you the area of a circle and asked for the circumference, you can determine the radius, and from the radius the diameter, and then the circumference. If they said "What is the circumference if the area of a circle is 36pi?" Area of a circle is pi*r2, which would give us a value for r = 6 Diameter is 2*r, or = 12. Circumference is d*pi, or 12pi