This document provides definitions of key geometry vocabulary terms from chapters 1-3, including: - Point, line, plane, compass, perimeter, area, whole numbers, integers, rational numbers, equation, midpoint, coordinate plane, ordered pair, opposite rays, angle, vertex, degrees, right angles, acute angles, obtuse angles, angle bisector, linear pair, supplementary angles, complementary angles, and congruent angles.

1. GEOMETRY
CHAPERS 1-3
VOCABULARY

2. POINT

3. The basic unit of
Geometry;
has no size and is labeled
with capital letters

4. LINE

5. A series of points that
extends without end in
two directions

6. PLANE

7. A flat surface that extends
without end in all
directions.

8. COMPASS

9. A tool used to draw arcs
and circles.

10. PERIMETER

11. The distance around a
figure.

12. AREA

13. The number of square
unites needed to cover a
figure’s surface.

14. WHOLE
NUMBERS

15. Numbers that include zero
and the counting numbers

16. INTEGERS

17. Zero, positive numbers,
and negative numbers

18. RATIONAL
NUMBERS

19. Any number that can be
written as a fraction (a/b)

20. EQUATION

21. A statement that includes
the symbol =

22. MIDPOINT

23. Separates a segment into
two segments of equal
length

24. COORDINATE
PLANE

25. The grid used to locate
points in a plane

26. ORDERED
PAIR

27. The coordinates of a point
that locates the point on
the coordinate plane

28. OPPOSITE
RAYS

29. Two rays that are part of
the same line and have
only their endpoints in
common.

30. ANGLE

31. A figure formed by two
noncollinear rays that
have a common endpoint.

32. VERTEX

33. The common endpoint of
an angle

34. DEGREES

35. The unit used to measure
angles

36. RIGHT ANGLES

37. An angle measuring
exactly 90°

38. ACUTE ANGLES

39. An angle measuring less
than 90°

40. OBTUSE
ANGLES

41. An angle measuring more
than 90°

42. ANGLE
BISECTOR

43. A ray that bisects the
angle

44. LINEAR PAIR

45. Two angles that share a
vertex and have a common
side, while the noncommon
sides form a straight line.
The angles add up to 180°

46. SUPPLEMENTARY
ANGLES

47. Two angles whose
measures add up to 180°

48. COMPLIMENTAR
YANGLES

49. Two angles whose
measures add up to 90°

50. CONGRUENT
ANGLES

51. Angles that have the same
measure