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Unit 2 Vocabulary


Acute Angle An angle whose measure is between 0 and 90.
Angle Formed by two rays with the same endpoint.
Angle Bisector A ray that divides an angle into two congruent angles.
Collinear Points Points that lie on the same line.
Congruent Angles A ray that divides an angle into two congruent angles.
Congruent Segments Segments with the same length.
Conjecture A conclusion reached though inductive reasoning.
Coordinate A point on a line or plane.
Coplanar Points and lines in the same plane.
Counter Example Enough to disprove a conjecture.
Inductive Reasoning Reasoning based on observed patterns.
Line Has length but no width or thickness. It extends without end in TWO directions.
Midpoint A point that divides a segment into two congruent segments.
Obtuse Angle Angle more than 90 degrees and less than 180 degrees.
Opposite Rays Rays that start at the same point and go in opposite directions.
Parallel Lines Are coplanar lines that do not intersect.
Perpendicular Lines Lines that intersect to form a right angle.
Plane A flat surface that has no thickness. It extends without end in all directions.
Point Has no length, width, or thickness, but has a position or location.
Postulate A statemnemt accepted to be true without proof.
Ray Part of a line that consists of an initial point and all points on the line that lie on one side of the initional point.
Right Angle 90 degree angle.
Segment Part of a line consisting of two points.
Skew Lines Are NONcoplanar lines. Therefore, they are not parallel and do not intersect.
Space The boundless 3-dimensional set of all points.
Created by: tbolden