Geometry 2.5

Axiom A-1: Existence of Angle Measure : Each angle <ABC is associated with a unique real number between 0 and 180, called its measure and denoted m<ABC.

Angles can have measure 0 or 180 : FALSE; they can't

Definition of Angle Bisector : For <ABC, and ray BD lying between the sides (rays) BA and BC such that m<ABD = m<DBC.

Angle Construction Theorem : For any two angles <ABC and <DEF such that m<ABC < m<DEF, there is a unique ray EG, such that m<ABC = m<GEF and ED-EG-EF.

Theorem 2.5.2 : Two angles that are supplementary, or complementary, to the same angle have equal measures.

Linear Pair Axiom : A ____ ____ of angles is a supplementary pair.

Angles greater than 180 exist. : FALSE

If two lines are perpendicular, they form four right angles at their point of intersection. : TRUE

Vertical Pair Theorem : Vertical Angles have equal measures.