The radius of a circle is defined as the distance from the centre-point to the circumference.
The formula for the area of a circle is pi x radius x radius or pi(r2).
The area of a circle is pi * radius2. If you already have the radius squared, you just have to multiply that by pi.
The radius of a semi-circle is the same as the radius of the circle that was cut in half. The radius of a circle is the distance from the center of the circle to any point on the circle. That's the same as 1/2 of the diameter. It's easy to measure it on a semi-circle, because you don't even need to determine where the center is. The diameter is just the length of the flat side, and the radius is half of that.
Use this formula where r is the radius: C = 2Pi(r)
there is no length or width of a circle. There is radius and circumference and the line that goes all the way through the center to the other side of the circle, which is twice the radius. But there is no length or width of a circle.
Area of a circle equals pi (3.14) times the radius squared.
First you determine the radius of the circle. If 6.6 feet refers to the diameter, divide that by 2 to get the radius. Then you use the standard formula for the area of a circle.
Measure its radius in feet or derive it from the diameter or circumference. A circle with radius r feet has an area of pi*r^2 square feet.
There is a constant relationship between the radius of a circle and its circumference. This is expressed in a formula.
Radius = 34.99112712 units Divide 3846.5 by pi and square root the result.
It's a radius of 8 feet from the center of the pitching rubber.