Geometry Vocabulary Review

1. Geometry Vocabulary Review Norton 4th Grade

2. Point • Names an exact location in space B

3. Line Segment • Part of a line with endpoints C D

4. End point • The points at either end of a line segment C D

5. Line • a straight path that continues in both directions with no end X Y

6. Ray • Part of a line with one end point and continues in the other direction with no end R Q

7. Plane • A flat surface that continues with out end in all directions

8. Dimension • A measurement along a straight line of a length, height, or width of a figure

9. One dimensional • A measure with only one direction such as length

10. Two dimensional • A measure with 2 dimensions, such as, height and width

11. Angle • Two lines or rays that share an endpoint

12. vertex • The shared endpoint of two lines or rays

13. degree • The unit used to measure angles 90 degrees

14. Acute angle • An angle less than 90 degrees

15. Right angle • A 90 degree angle

16. Obtuse angle • An angle more than 90 degrees

17. Intersecting lines • Lines that cross each other

18. Parallel lines • Lines that never intersect and are the same distance apart

19. Perpendicular lines • Lines that intersect at 90 degree angles

20. dimension • A measurement along the straight line of a length, height or width of a figure

21. One dimensional • A measure with only one direction such as length

22. Two dimensional • A measure with 2 dimensions, such as, height and width

23. Three dimensional • A measure with three dimensions, such as, height, width, and length

24. clockwise Moving in a circular path to the right – like the hands on a clock

25. Counterclockwise • Moving in a circular path to the left – opposite from a clock

26. diagonal • A line that has a slope or angle

27. horizontal • A flat line like the horizon, which is left to right

28. Line of symmetry • A line that divides a figure in half so that the 2 halves can be folded on top of each other

29. reflection • the movement of a figure to a new position by flipping the figure over

30. rotation • The movement of a figure by rotating the figure around a point

31. transformation • any movement of a figure (could be a translation, rotation or reflection)

32. translation • Moves a figure to a new position by sliding it

33. symmetry • Any shape that has symmetry has at least one line of symmetry

34. vertical • A line that goes straight up and down

35. face • Flat side of a figure

36. edge • Where two faces meet on a 3-D figure

37. Vertex (vertices) • Where three or more edges meet on a 3-D figure

38. sphere

39. Rectangular prism

40. pyramid

41. cube

42. cylinder

43. cone