# Geometry Vocabulary

 The flashcards below were created by user eatenbread on FreezingBlue Flashcards. Point represents a location, has no width or thickness Line has immeasurable length, no width or thickness, and is made up of infinite points, must have 2 points to define a line Line Segment part of a line with measurable length Ray part of a line with one endpoint and extends in one direction Plane a flat surface with width and length, but no thickness What defines a plane? 3 points on the same line Collinear Points points that lie on the same line Non-Collinear Points points that do NOT lie on the same line Coplanar Points points that lie in the same plane Non-Coplanar Points points that do NOT lie in the same plane Skew Lines lines in different planes that never intersect and are not parallel Congruent equal in measure Midpoint a point that divides a segment into 2 congruent parts Bisector a line that divides a segment/angle into 2 congruent parts Parallel Lines lines that never intersect Perpendicular Lines lines that intersect at right angles (90o) Angle the intersection of 2 rays at a common endpoint (called a vertex) Acute Angle measures less than 90o Obtuse Angle measures greater than 90o and less than 180o Right Angle measures 90o Complementary Angles 2 or more angles whose sum is 90o Supplementary Angles 2 or more angles whose sum is 180o Adjacent Angles 2 angles that share a common vertex and common ray Linear Pair 2 adjacent angles that are supplementary Congruent Angles angles with the same measure Vertical Angles 2 angles formed by 2 intersecting lines "across from each other" and are congruent Transversal a line that intersects 2 or more lines at different points Interior Angles inside angles Exterior Angles outside angles Corresponding Angles same position angles on different lines Conditional Statement any statement that can be written in IF-THEN form Hypothesis the part in a Conditional Statement after the IF Conclusion the part in a Conditional Statement after the THEN Axiom a statement that is accepted as true and applies to math in general Postulate a statement accepted as true and applies to a specific branch of math (like Geometry) Theorem a statement that can be proven true using terms, definitions, and postulates Converse switches the hypothesis and conclusion in a conditional statement Authoreatenbread ID103721 Card SetGeometry Vocabulary DescriptionMath Grade 9 SP Vocabulary Updated2011-09-23T01:45:06Z Show Answers