Term

Definition
if m is the midpoint of line AB, then line AB = 1/2(AB) & line MB = 1/2(AB) 


Term

Definition
if line BD bisects angle ABC, then angle ABD = 1/2 (angle ABC) and angle DBC = 1/2 (angle ABC) 


Term
Definition of complementary angles 

Definition
pair of angles whose sum = 90 degrees 


Term
Definition of supplementary angles 

Definition
pair of angles whose sum = 180 degrees 


Term
Definition of vertical angles 

Definition
pair of angles formed by 2 intersection lines; those angles ARE NOT adjacent (don't share a line) 


Term

Definition
vertical angles are congruent 


Term
Definition of Perpendicular Lines 

Definition
2 lines that intersect to form a right angle 


Term
If 2 lines are perpendivular 

Definition
then they form congruent adjacent angles 


Term
If two lines form congruent adjacent angles 

Definition
then they are perpendicular 


Term
If the exterior sides of 2 acute adjacent angles are perpendicular 

Definition
then the angles are complementary 


Term

Definition
if 2 lines are perpendicular then the angles formed measure 90 degrees 


Term
Complementary Angle Theorem 

Definition
Complements of angles that are congruent are congruent 


Term

Definition
sum of all the parts (either segments of angles) equals a whole 


Term

Definition
If B is the midpoint of AC, then AB = BC 


Term
Definition of an Angle Bisector 

Definition
If line BZ bisects angle ABC, then line AB = line BC 


Term
Definition of a right angle 

Definition
An angle that measures to 90 degrees 

