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1. point

   An exact location, shown with a dot

2. line

   A straight path that goes on forever in both directions

3. ray

   Part of a line with one endpoint that goes on forever in one direction

4. line segment

   Part of a line with two endpoints

5. angle

   Two rays that share the same endpoint

6. vertex

   The point where two rays or sides meet

7. degree

   The unit used to measure angles

8. protractor

   A tool used to measure angles

9. right angle

   An angle that measures exactly 90 degrees

10. acute angle

    An angle that measures less than 90 degrees

11. obtuse angle

    An angle greater than 90 degrees but less than 180 degrees

12. straight angle

    An angle that measures exactly 180 degrees

13. parallel

    Lines in the same plane that never meet and stay the same distance apart

14. perpendicular

    Lines that meet to form right angles

15. intersecting

    Lines that cross at one point

16. equilateral

    A triangle with all three sides the same length

17. isosceles

    A triangle with at least two sides the same length

18. scalene

    A triangle with no sides the same length

19. quadrilateral

    Any polygon with four sides

20. parallelogram

    A quadrilateral with two pairs of parallel sides

21. trapezoid

    A quadrilateral with at least one pair of parallel sides

22. rhombus

    A parallelogram with four sides of equal length

23. polygon

    A closed flat shape made of straight sides

24. symmetry

    When a figure can be folded along a line so both halves match exactly