The circumference of a 12 cm circle is: 37.7 cm
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Circumference = pi x diameter. So the circumference of a circle with diameter 12 cm = pi x 12 = 37.7 cm (1 decimal place.)
37.7 cm
The circumference of circle that is 8 cm is: about 25.13 cm (diameter x pi = circumference).
The circumference of a 7 cm circle is: 21.99 cm(diameter x pi = circumference).
The circumference of a circle with an 81.6 cm diameter is: 256.4 cm