The radius is 1.43
If the height is 9 and the volume is 21, then the radius = 0.8618
9
radius = 18/2 = 9 cm
The answers is in the question.
The radius is 1.43
The diameter of a circle is twice the radius. A circle with a radius of 9 would have a diameter of 18. (9*2=18).
The radius is 1.43
Since your circle has a diameter of 9 feet (the definition of a "9 by 9" circle), the radius is half of that distance. In this case, your radius is 4.5 feet or 54 inches.
The radius is about 1.432 units.
9 inches.
Circumference = 2Π• radius 2Π•9 = (18×Π)"≈ 56.5"
r= 9 so diameter is 2x the radius =18 cm
A circle with a radius of 9 inches has a circumference of 56.55 inches.
If the height is 9 and the volume is 21, then the radius = 0.8618
9
radius = 18/2 = 9 cm