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transversal

form 8 angles when intersecting 2 other lines

corresponding angles

any pair of angles in similiar locations with respect to the transversal and other lines

parrllel

----->--- if two lines have the same clope and they are cut by the same traversal line

------>----

------>----

corresponding angles postulate

two corresponding angles have the same measure if the lines are parrallel

(look at notebook drawings before test)

(look at notebook drawings before test)

how to find slope

y2-y1

-------

x2-x1

-------

x2-x1

parrallel slopes and lines theorem

two non vertical lines are parrellel if they have the same slope

transitivity of parrallelism theorem

if a is parrellel to b and b is parallel to c then a is parrellel to c

perpendicular lines

two segments rays or lines are perpendicular if they form a 90 degree angle ----l-----

two perpendicular theorem

if two coplaners are each perpendicular to the same line then they are parrellel

perpendicular to parallel theorem

if they lie perpendicularto one of the two parraelle lines then it must be perpendicular to the other (lok=ok at notebook before test)

perpendicular lines and slope theorem

if the slope of a perpenddicular liine is m then the slope of a lineperpendicular to it is

-1

-----

m

-1

-----

m

bisector of a segment

if any point line or ray or other segmetn that itersects a segment at its midpoint

perpendicular bisector

a bisector that is perpendicular to the segment