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# CH 1/2 terms

### definitions, postulates, and theoroms

TermDefinition
congruent segments segments if AB=BC then AB is congruent to BC
definition of midpoint If B is the midpoint of AC, then AB is congruent to BC
segment bisector if line l bisects ACM at B then B is the midpoint of AC and AB is congruent to BC
congruent angles if A=B then A is congruent to B
vertical angles if 1 and 2 are vertical angles and 3 and 4 are vertical angles
right angles if S is a right angle then S=90
linear angles 1 and 2 are linear angles
complementary angles If 1 and 2 are complementary angles, then 1 + 2=90
Supplementary angles If 1 and 2 are complementary angles, then 1 + 2=180
angle bisector if AY bisects XAY then XAY is congruent to YAZ
perpendicular lines if AB is perpendicular to CD then they form right angles
perpendicular bisector If EF is perpendicular to bisector of GH then GJ is congruent to JH and EJG is a right angle.