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Unit 2 vocabulary

vocabulary 15

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