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Unit 2 voc.

`Three undefined terms in geometry points, lines, and planes
point has no length, width, or thickness, but has a position.
space is the boundless 3-dimensional set of all points.
line has length, but no width or thickness. it extends without end in two directions.
collinear points points that lie on the same line are collinear points.
plane is a flat surface that has no thickness. it extends without end in all directions.
coplanar points and lines in the same plane
intersecting lines lines shaes a point
intersecting planes share an indefinite number of points who two planes 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 lines intersect then they intersect in exactly one point.
postulate 1-3 if two planes then they intersect in axactly one line.
postulate 1-4 through any three noncollinear points there are exactly one plne.
line segment is a portion or a line between two points, called endpoints
ray is a part of a line that consists of an initial point and all points on the line that lie on the side of the initial 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 ot parallel and not intersect.
perpendicular lines lines intersect to form right angles.
parallel planes are planes that do not intersect
Ruler Postulate the distance betwwen any two points on a number line is a absolute value of the difference of the corresponding numbers.
congruent segments twos egments with the same length.
midpoint of a segment a pont that divides a segment into two congruent segments. it bisects the segment.i
bisector of a segment any line, ray or other segment through a midpoint.
angle two arys that are connected at their endpoints
protractor device used to measure angles
acute angle less than 90%
obtuse angle greater than 90%
right angle exactly 90%
congruent angles with the same measures
angle bisector ray that divides an angle into 2 congruent(=)angle
inductive reasoning is a type reasoning that reaches conclusions based on a pattern of specific eaxamples or past events
counterexample is an example that proves a conjectures is false.
conjecture a conclusion reaches by using inductive reasoning.
Created by: lilnat337