12 inch
2 inches. the radius is half of the diameter
6 inch
11.5 inches for a 23-inch diameter circle. If you meant the circumference is 23 inches, then the radius would be 3.6606 inches.
If you are talking about 9 and 12 inch diameter, then divide both by 2 to get the radius. The area of a circle is pi (3.1415 is good for most calculations) multiplied by the square of the radius. So for the 12 inch circle, the radius is 6. The square of the radius is 36, and multiplying this by pi gives approximately 113.1 square inches. Now the 9 inch circle has a radius of 9/2 or 4.5. Squaring this we get 20.25, which multiplied by pi is approximately 63.6 square inches. If 9 and 12 were already the radius in the problem, just don't divide by 2 since you already have the radius.
12 inch diameter(also 6 inch radius).
12 inch diameter(also 6 inch radius).
A circle with a 12 inch diameter has a 6 inch radius.
The radius of a circle with a 14.5 inch circumference is 2.15 inches
38: the diameter of a circle is twice its radius.
A four-inch radius circle has an area of about 50.27 square inches.
If the circumference is 38, the diameter is 38/pi. Since the radius is half of the diameter, the radius is 19/pi.
12 inch
1 inch
The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.
radius of 31 inches
The radius is one-half of the diameter. Hence, the radius of a 76 in diameter circle is 38 in.