CHAPTER 1 VOCAB
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Inductive Reasoning: reasoning that is based on patterns you observe.
Conjecture: a conclusion you reach using inductive reasoning.
Counterexample: An example that is used to prove conjectures false.
Net: a 2-D pattern that forms a 3-D figure.
Point: Location represented by a dot and named with a capital letter.
Space: the set of all points.
Line: A series of points that extend in opposite directions with no end.
Collinear Points: Points that lie on the same line.
Plane: Flat surface that contains lines and extends in all directions named by a
single capital letter or 3 noncollinear points.
10. Coplanar: Points and lines in the same plane.
11. Postulate/Axiom: Math facts.
12. Segment: the part of a line with 2 endpoints containing all the points between
them.
13. Ray: part of a line with one endpoint and extends to include all points on one side
of that endpoint.
14. Opposite Rays: 2 collinear rays with the same endpoint. (forms a line!)
15. Parallel Lines: coplanar lines with no intersection.
16. Skew Lines: noncoplanar; not parallel but never intersect
17. Parallel Planes: planes that do not intersect
18. Coordinate: The distance and direction a point is from the origin on a number
line.
19. Congruent Segment: Two segments with the same length.
20. Midpoint: A point that divides a segment into two congruent segments.
21. Angle : 2 rays with the same endpoint. Ways to name them!!
22. Acute Angle –less than 90 degrees
23. Right Angle – 90 degrees
24. Obtuse Angle – between 90 and 180 degrees
25. Straight Angle – 180 degrees
26. Congruent Angles - Angles with the same measure.
27. Vertical Angles: Two angles whose sides are opposite rays.
28. Adjacent angles - Two coplanar angles with a common side, a common vertex
and no common interior points
29. Complimentary angles: 2 angles whose sum is 90 degrees
30. Supplementary angles: 2 angles whose sum is 180 degrees
31. Construction – formed by the use of a straightedge and compass.
32. Drawing- formed by a ruler and protractor.
33. Bisect- cut in 2 congruent parts
34. Perpendicular Bisector –
A line, segment, or ray that is perpendicular to a
segment at its midpoint.
35. Angle Bisector –A ray that divides an angle into two congruent coplanar angles.