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18 inches

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Q: If the radius of a circle is 9 inches what is the diameter?
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What is the circumference and diameterof a circle with a radius of 9 inches?

A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.


The diameter of a circle is 9 inches what is the radius?

Radius = Diameter/2. So in this case 4.5 inches.


If the radius of a circle is 15 inches what is the diameter?

R=D/2. If the diameter of a circle is 18 inches, the radius is 9 inches. Radius = 1/2 diameter or 9"


If The exact area of a circle is 81pi square inches what are the radius and diameter of the circle explain?

The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches


What is the radius of 18 inches?

If the diameter of a circle is 18 inches then its radius is 18/2 = 9 inches


What is the diameter of a circle with a 9 radius?

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).


What is the radius of a 9ft by 9 ft circle?

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.


What is the radius of a 9 inch circle?

Circumference of 9 inches: 2.864788975654119in. (for pi I used 3.14159265358979) Diameter of 9 inches: 4.5in.


What is the diameter of a circle with a radius of 9 m?

the diameter of a circle with the radius of 9m is 18m


What is a circumference of a circle with the radius of 9 inches?

A circle with a radius of 9 inches has a circumference of 56.55 inches.


What is the circumference of a circle with a radius of 9 inches?

pi x diameter diameter=radius2 9x2=18 18xpi=56.548


What is the area of a circle with a diameter of 6 in?

The formula for area of a circle is: A = (pi)*r^2 If the diameter of a circle is 6 then the circle's radius is 3. So, A = (pi)*(3)^2 A= 9*(pi) inches squared or A = 28.26 inches squared (rounded)