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Geometry Chapter 01 Vocabulary

Dr. Jerome Braunstein

Geometry Chapter 01 Vocabulary

acute angle  a flat surface that has no thickness
angle bisector  a ray that divides an angle into two congruent coplanar angles
collinear points  distance and direction from the origin of a number line
congruent angles  a 180 degree angle
congruent segments  an angle between 90 and 180 degrees
conjecture  a 90 degree angle
coordinate  angle with the same measure
coplanar  part of a line consisting of two endpoints and all points between them
counterexample  noncoplanar lines
inductive reasoning  coplanar lines that do not intersect
obtuse angle  points that lie on the same line
parallel lines  an accepted statement of fact
parallel planes  a line, segment, or ray that is perpindicular to the segment at its midpoint
perpindicular bisector  part of a line consisting of one endpoint and all the points of the line on one side of the endpoint
perpindicular lines  reasoning based on patterns one observes
plane  points (or lines) that are in the same plane
postulate  a conclusion reached using inductive reasoning
ray  planes that do not intersect
right angle  a positive angle less than 90 degrees
segment  two segments with the same length
skew lines  two lines that intersect to form right angles
straight angle  an example for which the conjecture is incorrect

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