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

Diameter of 9 inches:

4.5in.

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Q: What is the radius of a 9 inch circle?
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What is the area of a 12 inch and a 9 inch circle?

The area of a circle is calculated using the formula A = πr^2, where r is the radius of the circle. For a 12-inch circle, the radius is half of the diameter, so the radius is 6 inches. Therefore, the area of the 12-inch circle is A = π(6)^2 = 36π square inches. Similarly, for a 9-inch circle, the radius is 4.5 inches, so the area of the 9-inch circle is A = π(4.5)^2 = 20.25π square inches.


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