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A circle is the set of all points that are equidistant (the same distance) from a single point called the center. The circumference is boundary (perimeter) of the circle. The length of the circumference is the distance around a circle. The radius is the distance from the center to any point on the circumference of the circle. The diameter is the length of a line segment that passes through the center and whose endpoints are on the circumference of the circle.