Circumference is Diameter x Pi.
Diameter is equal to 2 x Radius.
Pi is approximated as 3.14159.
Knowing this, you can calculate from there.
2 x 7 x 3.14159 = about 43.98
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The radius of the circle is 7.
The circumference is about 43.98 inches. The circumference of a circle is diameter (radius x2) x pi (3.14).
circumference of a circle = 2*pi*radius or diameter*pi
43.982"
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