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Point

Point. An exact location in space. A Label: Point A. Line. A set of points continuing without end in both directions. • • B C Label: BC. Segment. Two points and the straight path between them. • • D E

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Point

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  1. Point An exact location in space. • A Label: Point A

  2. Line A set of points continuing without end in both directions. • • B C Label: BC

  3. Segment Two points and the straight path between them. • • D E Label: DE

  4. Endpoint The point at the end of a segment or ray. • • D E Label: Point D or Point E

  5. Ray A set of points that has one endpoint and that extends without end in one direction. • • F G Label: FG **The first letter in the label is the endpoint of the ray.

  6. Plane A flat surface that extends without end in all directions. H Label: Plane H

  7. Parallel Lines Lines in a plane that never touch. • • J K • • L M Label: JK and LM

  8. Intersecting Lines Lines that meet at a point. • • N R • • Q P Label: NP and QR

  9. Perpendicular Lines Intersecting lines that form right angles (90° angles). • S • • U V • T Label: ST and UV

  10. Skew Lines Lines that are in two different planes. • T • S • • U V Label: ST and UV

  11. Angle Figure formed when two rays meet at a common endpoint. C • • • A B Label: A, BAC, or CAB

  12. Vertex The endpoint where two rays meet. C • • • A B Label: Point A

  13. Right Angle The measure of the angle is 90°. • D • • E F Label: E, DEF, or FED

  14. Straight Angle The measure of the angle is 180°. • • • G H I Label: H, GHI, or IHG

  15. Obtuse Angle The measure of the angle is between 90° and 180°. K • • • J L Label: J, KJL, or LJK

  16. Acute Angle The measure of the angle is between 0° and 90°. N • • • M P Label: M, NMP, or PMN

  17. Complementary Angles Two angles whose measures add up to 90°. R • • S • • Q T Label: RQS and SQT

  18. Supplementary Angles Two angles whose measures add up to 180°. X• • • • W V Y Label: WVX and XVY

  19. Adjacent Angles Angles that have a common vertex and a common side between them. • • B C Z• • D A • Label: BZC and CZD

  20. Vertical Angles Angles formed by two intersecting lines and sharing only a vertex. • • J K M• • L N • Label: JMK and NML

  21. Circle A plane figure with all points the same distance from a given point called the center. K• Label: Circle K

  22. Center Point in the circle that is exactly in the middle. K• Label: Point K

  23. Chord A segment with both endpoints on the circle. D • • E Label: DE

  24. Diameter In a circle, a segment that passes through the center and has both endpoints on the circle. G• K• H• Label: GH

  25. Radius In a circle, a segment that connects the center of the circle with a point on the circle. J• K• Label: JK

  26. Central Angle An angle with its vertex at the center of a circle. L• K• Label: LKM •M

  27. Arc Part of a circle. L• K•  Label: LM •M

  28. Polygon A closed figure made of three or more segments.

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