12 inch
2 inches. the radius is half of the diameter
6 inch
It is customary to call a circle a 38 inch circle if its diameter is 38 inches. If that is the case, the radius = diameter/2 = 19 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.
The answer depends on whether the 23 inch refers to its radius or diameter.
Circumference of a circle: 2*pi*radius or diameter*pi
A circle with a 12 inch diameter has a 6 inch radius.
Area of circle = pi x r x r where r is the radius. You do not specify if 23 inch is the diameter or radius of the circle. Anyway pi = 3.1415 so plug in the value of the radius in the formula above and you will get the area in square inches. Then divide that by 144 to get area in square feet.
The radius of a circle with a 14.5 inch circumference is 2.15 inches
A four-inch radius circle has an area of about 50.27 square inches.
12 inch
1 inch
A circle with a radius of 23 units has an area of 1,661.9 square units.
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 Diameter of a Circle is twice the Radius.thus for a 52 inch Diameter Circle the Radius will be 52/2=26 inches.