2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
If a circle has a circumference of 18pi, the radius is 9.
Doubling the radius doubles the circumference.
Circumference of 9 inches: 2.864788975654119in. (for pi I used 3.14159265358979) Diameter of 9 inches: 4.5in.
A circle with a radius of 4.5 cm has a circumference of 28.27 cm
A circle with a radius of 9 inches has a circumference of 56.55 inches.
2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
If a circle has a circumference of 18pi, the radius is 9.
Doubling the radius doubles the circumference.
The circumference of 9 inch diameter circle is about 28.27 inches.
The radius is 1.43
Circumference of 9 inches: 2.864788975654119in. (for pi I used 3.14159265358979) Diameter of 9 inches: 4.5in.
Circumference = 2Π• radius 2Π•9 = (18×Π)"≈ 56.5"
A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.
The radius is about 1.432 units.
circumference = 2*pi*9
56.549