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- 1. CIRCLES
- 2. CIRCLE • A closed curve figure, all points of which are equidistant from a fixed point called vertex.
- 3. Parts of a circle
- 4. RADIUS • A segment whose endpoints are in the center of the circle and the other endpoint is on the circle.
- 5. Chord • Is a segment whose endpoints are any two points on the circle.
- 6. Diameter • A chord which passes through the center of a circle.
- 7. Secant • Line that intersects the circle at two points
- 8. Tangent • Is a line in the plane of a circle that intersects the circle at exactly one point. This point is called the point of tangency.
- 9. Central Angle • An angle formed by two radii of a circle with vertex on the center of the circle.
- 10. Arc • A part or a portion of a circle.
- 11. Semi - circle • Half of a circle, it measures 180 .
- 12. Minor Arc • Less than half of a circle
- 13. Major Arc • More than half a circle.

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