# Geometry Definitions

 How do you name a line? single lower case letter OR two points contained on the line How do you name a plane? capital letter OR 3 noncollinear points How do you name a segment? the two endpoints How do define a point, line and plane? They are UNDEFINED. Collinear Points all points lie on the same line Coplanar all points lie on the same plane Where does a point and a line intersect? intersect at a point Where do 2 lines intersect? one point Where does a line and a plane intersect? it depends. poked through = one pointwhole line = infinite amount of points Where do two planes intersect? At a line What is a space? the set of all points AB a length AB^___ (with line over top) a segment Congruent same size and shape Tick Marks indicate congruency (shape but not size) Midpoint the midpoint of segment AB is the point between A & B where AM=MB segment bisector segment, line, or plane that intersects a segment at its midpoint ray one a line, 1 point (endpoint) and all points extending off in one direction angle figure formed by 2 non-collinear rays having same endpoint congruent angles <'s with the same measure Angle bisector divides an angle into 2 CONGRUENT angles adjacent angles have a common side and vertex, No overlap or gap. vertical angles 2 non-adjacent angles formed by intersecting lines linear pair adjacent angles whose non-common sides form opposite rays.(sum of measures= 180) complementary angles 2 angles whose sum is 90 supplementary angles 2 angles whose sum is 180 perpendicular lines (upside down T) intersect to form right anglesform adjacent angles (rays,segments or planes can be perpendicular) inductive reasoning using examples to make a conjecture counterexample example proving a conjecture false statement sentence which is either T or F (truth value) negation opposite of a statement (not...) (~p) compound statement join 2 statements conjunction joined with the word AND T=both true disjunction joined with OR T=at least one true venn diagrams conjuctions are intersections (overlap) disjunctions are unions (whole thing) If______, then_______ if hypothesis, then conclusion converse switches the hypothesis & conclusion in conditional Inverse negate both hypothesis and conclusion in conditional Contrapositve Negate and Switch hypothesis and conclusion OR negate hypothesis and conclusion of the converse deductive reasoning using rules to make a conclusion Law of Detachment if conditional is true and hypothesis is true, then conclusion is true Law of Syllogism if p-> q and q->r are true, then p->r is true. if mp definition, then.... = if mp theorem, then...q CONGRUENT Authorkristajrco8 ID37530 Card SetGeometry Definitions Descriptiondefinitions up to chapter 2 Updated2010-10-29T04:05:59Z Show Answers