The circumference of a 7 cm circle is: 21.99 cm(diameter x pi = circumference).
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Circumference = 2 pi R = 14 pi = 43.9823 cm (rounded)
The circumference of a 12 cm circle is: 37.7 cm
The circumference of circle that is 8 cm is: about 25.13 cm (diameter x pi = circumference).
The circumference of a circle with an 81.6 cm diameter is: 256.4 cm
The circumference of a circle with an 8 cm radius is: 50.27 cm