Area of circle: pi times 2 squared = 4*pi square inches
Area of a circle = pi times radius squared
Area = pi * radius * radius radius = diameter / 2 radius = 16/2 = 8 Area = 64 * pi Area 201.062 inches2
1 inch
The area ( A ) of a circle can be calculated using the formula ( A = \pi r^2 ), where ( r ) is the radius. For a circle with a 6-inch radius, the area is ( A = \pi (6)^2 = 36\pi ). Approximating ( \pi ) as 3.14, the area is approximately ( 36 \times 3.14 ), which equals around 113.04 square inches. Thus, the approximate area of the circle is about 113 square inches.
2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
Area of a circle = pi times radius squared
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.
1/2 inch
In a circle, Area = pi times radius squared: A = (pi)(r^2) Since the diameter equals 2 inches, the radius is one inch: A = (pi)(1^2) A = pi = 3.14 inches squared
The formula to calculate the area of a circle is A = πr^2, where A is the area and r is the radius. Given a radius of 4 inches, we can substitute r = 4 into the formula to find the area. Therefore, the area of a circle with a 4-inch radius is A = π(4)^2 = 16π square inches, or approximately 50.27 square inches.
Area = pi * radius * radius radius = diameter / 2 radius = 16/2 = 8 Area = 64 * pi Area 201.062 inches2
1 inch
The area ( A ) of a circle can be calculated using the formula ( A = \pi r^2 ), where ( r ) is the radius. For a circle with a 6-inch radius, the area is ( A = \pi (6)^2 = 36\pi ). Approximating ( \pi ) as 3.14, the area is approximately ( 36 \times 3.14 ), which equals around 113.04 square inches. Thus, the approximate area of the circle is about 113 square inches.
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.
If that's the radius, use the standard formula for the area of a circle. If it's the diameter, divide it by 2 first, to get the radius.
The diameter of a 28-square inch circle is: 5.971 inches.