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Unit 2 vocabulary
vocabulary 15
| Question | Answer |
|---|---|
| acute angles | less than 90 degrees |
| point | has no length width or thickness but has a position has location |
| space | is the boundless 3-dimensional set of all points. |
| Line | has a length, but no width or thickness. it extends without end in two directions |
| Coplanar | points and lines in the same plane |
| intersecting Lines | lines share a point |
| intersecting planes | sahre an indefinite number of points when tow palnes intersect, the intersection is a line |
| Postulate | A statement accepted to be true without proof |
| postulate 1-1 | through any two points there is exactly one line |
| postulate 1-2 | If two line intersect then they intersect in excatly one point. |
| Postulate 1-3 | If two planes then they intersect in exactly one line |
| postulate 1-4 | through any three noncollinear points there is excatly one plane. |
| Line segment | is a portion or a line between two points, called endpoints |
| Ray | is a part of a line that consits of an inital point and all points on the line that lie on ine side of the inital point |
| opposite rays | start at the same point and go in opposite directions |
| Parallel Lines | are coplanar lines that do not intersect |
| Skew Lines | are noncoplanar lines therefore they are not parallel and do not intersect |
| Perpendicular Lines | Lines intersect to form right angles. |
| Parallel planes | are planes that do not intersect |
| Ruler postulate | The distance between any two points on a number line is the absolute value of the difference of the corresponding numbers. |
| Congruent Segments | Two segments with the same length. |
| Midpoint of a Segment | a point that divides a segment into two congruent segments. It bisects the segment |
| Bisector of a segment | any line, ray or other segment through a midpoint |
| angle | two rays that are concted at their endpoints |
| Protractor | Device used to measure angles |
| Obtuse Angle | more than 90 degrees |
| Right angle | Excaty 90 degrees |
| Congruent angles | With the same measures |
| Angle Bisector | ray that divides an angle into two congruent (=)angles |
| conjecture | is a conclusion reached by using inductive reasoning |
| Inductive reasoning | is a type reasonings that reaches conclusions based on a pattern of specific examples or past events |
| counterExample | is an example that proves a conjecture is false |
Created by:
niya19
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