Parts of a Circle Diagram with Definitions

Diagram showing parts of a circle with labeled elements including radius, diameter, circumference, chord, segment, sector, and arc.

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- Arc: A portion of the circumference of a circle.
- Chord: A line segment whose endpoints lie on the circle.
- Circumference: The distance around the circle; its perimeter.
- Diameter: A chord that passes through the center of the circle; twice the radius.
- Radius: A line segment from the center of the circle to any point on its circumference.
- Sector: A region bounded by two radii and the included arc.
- Segment: A region bounded by a chord and the arc subtended by the chord.
- Secant: A line that intersects the circle at two distinct points.
- Tangent: A line that touches the circle at exactly one point.

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