Area= pi × radius2
Area= 3.14 × (4.5 in2)
Area= 3.14 × 20.25
Area= 63.585 in2
The answer is 63.585. You would find this answer by doing this:
20.25
x3.14
_______
8100
20250
+607500
_______
635850
Then you would take the zero off the end.
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The area of a circle is calculated using the formula A = πr^2, where r is the radius of the circle. Since the diameter is twice the length of the radius, the radius of a 9-inch diameter circle would be 4.5 inches. Plugging this into the formula, the area of the circle would be A = π(4.5)^2 = 63.585 square inches.
Area = pi*9*9 square inches
The circumference of 9 inch diameter circle is about 28.27 inches.
The area of a circle with a diameter of 9 inches is: 63.62 square inches.
The area of a 9-meter diameter circle is 63.617 square meters.
The formula for the area of a circle is A = PI R squared.Pi is about 3.1416R is the radius, half the diameter or 18/2 = 9A= 3.1416 * 9 * 9 = 254.4696 Using more digits in PI will give slightly different answers such as3.14159265359 * 9 * 9 = 254.469004941 which still is about the same value.So the area of an an 8 inch diameter circle (rounded) is about 254.5 square inches