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Geometry Vocabulary

Geometry Vocabulary. Angle. Made up of 2 rays joined together at a common point called a vertex. The angle is. Circle. The set of points on a plane at a certain distance, or radius, from a single point, the center. Perpendicular Line. Two lines that intersect at a right angle (90°).

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Geometry Vocabulary

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  1. Geometry Vocabulary

  2. Angle Made up of 2 rays joined together at a common point called a vertex. The angle is

  3. Circle • The set of points on a plane at a certain distance, or radius, from a single point, the center

  4. Perpendicular Line Two lines that intersect at a right angle (90°). Written as

  5. Parallel Line Lines in a plane that either do not share any points and never intersect, or share all points. Written as

  6. Line Segment A line with two endpoints. Written as

  7. Point An exact position or location in a given plane. Is represented by a dot and named with a capital letter. Point A or Point B

  8. Line The set of points between points in a plane and the infinite number of points that continue beyond the points. Written as Q P

  9. Ray A line that has one endpoint and continues on forever in the opposite direction. B C D E A

  10. Right Angle An angle that measures 90°.

  11. Acute Angle An angle measuring less than 90° but greater than 0°.

  12. Obtuse Angle An angle measuring greater than 90° but less than 180°.

  13. Straight Angle An angle measuring exactly 180°.

  14. A triangle with no congruent sides. SCALENE TRIANGLE

  15. A triangle with two congruent sides. ISOSCELES TRIANGLE

  16. Points that lie in the same plane. COPLANAR

  17. Points that lie on the same line. COLLINEAR M R A A, R, & M are collinear points

  18. Congruent Figures are congruent if they have the same shape, size, lines, and angles.

  19. Two segments that have the same length. CONGRUENT SEGMENTS K O A Y

  20. Have the same shape but not necessarily the same size. SIMILAR 5 4 10 8 3 6

  21. To divide into two congruent parts. L BISECT J K M bisects LJM

  22. The point that divides a segment into two congruent segments. MIDPOINT C O B O is the midpoint of

  23. A closed plane figure formed by three or more segments such that each segment intersects exactly two other segments only at their endpoints and no two segments with a common endpoint are collinear. POLYGON

  24. A polygon that is both equilateral and equiangular. REGULAR POLYGON

  25. Equilateral • Having all sides the same length

  26. Altitude a line that extends from one vertex of a figure perpendicular to the opposite side, this is the height of figure.

  27. Perpendicular Bisector • A line which cuts a line segment into two equal parts at a 90° angle

  28. Interior Angle = Inside Angle A B C Exterior Angle= Outside Angle

  29. A corner or point where lines, rays, polygons, or other geometric figures meet. VERTEX vertex

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