The area is 254.47 in2
The answer is 254.469005cm squared
Using 3.14 as Pi the area of circle is: 254.34
area of a circle = pi r squared = pi x (9 squared) = 254.47 to 2 decimal places
Using 3.14 as Pi the area of circle is: 254.34
Area = pi*9*9 square 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.
2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
Radius is 3 times as large so area is 3*3 = 9 times as large.
A circle with a radius of 9 feet has an area of 254.47 square feet.
If you triple the radius of a circle, the area will increase by 9. Area is proportional to the square of the radius.
The area of a circle with a radius of nine centimeters is: 254.5 cm2
A=pi X radius squared 3.14 X 9=28.26 sq. inches
Area of a circle of radius r = πr2Area of circle of radius 9 In = π(9)2 = π x 81 , putting value of pi we get= 3.14159625 x 81 = 254.46 sq. In
A circle with a radius of 9 feet has an area of 254.47 square feet.
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
The radius is 9 feet.
No. Area of 3 inch circle is 9/4 pi so two of them total 9/2 ie 4.5 pi. Area of 6 inch circle is 9 pi, the equivalent of 4 of the smaller circles!