18 pi inches
A circle with a radius of 9 inches has a circumference of 56.55 inches.
A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.
C = ~56.55 inches.
2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
Circumference is 2 times pie (which is often rounded to 3.14) times the radius. The result is 56.52 inches.
r2*pie=circumference 9(9)*pie 81*pie 254
If the radius of a circle is 8.5 inches the circumference is: 53.4 inches
If the circumference of a circle is 24 inches the radius is: 3.82 inches.
The radius of a circle with a circumference 36 inches is: 5.73 inches.
A circle with a radius of 2.5 inches has a circumference of 15.71 inches.
A circle with a radius of six inches has a circumference of 37.7 inches.
A circle with a radius of 16 inches has a circumference of 100.53 inches.