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