~37.6991118431 It would, of course, go on forever, but that's a close approximation.
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75.39816
12
circumference = diameter x pi = 12 units x 3.1416 = 37.7 units (approx)
Circumference = pi x diameter. So the circumference of a circle with diameter 12 cm = pi x 12 = 37.7 cm (1 decimal place.)
The formula for working out the circumference is 2pi x radius, aka pi diameter. The radius is 6 so times this by 2 and then pi. The answer would be: (6 x 2) x pi = 12 x pi = 37.69911184. Pay attention in maths lessons next time! ;) Hope this helps.