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The center of a circle is called the origin. It is a point at one end of a radius, the other end of which defines the circumference of the circle.
A chord is a straight line that extends from one point of the circumference of a circle to another point on the circumference and the diameter of a circle is its largest chord
circular error probable (CEP)
The diameter of a circle is the length of any line segment drawn through the center of the circle and having endpoints on the line that defines the circumference of the circle. It can also be defined as twice the radius of the circle, with a radius being a line segment with an endpoint at the center of the circle and one on the circumference of the circle.Diameter is a length measurement
A circumference, C, of 80 feet defines a circle of radius R as C = 2 pi R and the area of the circle is A = pi R^2 A = C^2/4pi = 509.55 sq ft