quiz 3

Definition of Congruence

• $m\angle A=m\angle B\longleftrightarrow\angle A\cong$

• $m\angle B=m\angle A\longleftrightarrow\angle B\cong\angle A$

Definition of Angle Bisector

• an angle bisector divides an angle into two equal parts.

• An angle bisector divides an angle into three parts

Definition of Complementary Angles

• $Complentary\ \longleftrightarrow\ is\ 180\ \deg.$

• $Complementary\ \longleftrightarrow\ Sum\ is\ 90\ \deg.$

Definition of Supplementary angles

• sum is 180

• sum is 90

Definition of perpendicular

• Perpendicular lines form right angles

• perpendicular form obtuse angles

Definition of a right angle

• right angle equal 90

• right angle equal 180

angle addition postulate

• $m\angle ABD+m\angle DBC=m\angle ABC$

• $m\angle ABD+m\angle CBD\ =m\angle BCD$

Vertical angles theorem

• if two angles are vertical, then thy are congruent

• If two angles are not vertical, then they are congruent

complement theorem

• $Right\ Angle\rightarrow Complementary$

• $complementary\rightarrow right\ angle$

Supplement theorem

• $linear\ pair\rightarrow\sup plmentary$

• $If\ \angle a\ is\ complementary\ to\ \angle B\ and\ \angle C\ is\ complementary\ to\ \angle B\ then\ \angle A\cong\angle C$