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The ratio of a circle’s circumference to its diameter. Its value is approximately 3.14, andits symbol is the Greek letter \pi

A set of points that has the same fixed distance from a point, called the center of the circle.

Length of the boundary of a circle or ellipse

Any line segment from the center of a circle to its circumference

The part of a circle that lies between two points on its circumference

A measure of the separation between two rays which share a common starting point

The part of a line that lies between two points on that line

Every number in a multiplication problem that is multiplied is called a factor.