Parallel Lines
Concept
Two lines AB and CD are parallel lines, if
they are on the same plane have no points in
common, meaning that regardless of how far
they extend, they never intersect.
Properties of parallel lines
a.
Reflexive: Every line is parallel to itself
b.
Symmetric: If AB || CD
c.
Transitive: If AB || CD and CD || EF
AB || EF.
CD||AB
Symetric property
Transitive property
Transversal
Angles formed by a transversal
a.
Supplementary angles
b.
Vertical angles
c.
Interior and exterior angles
d.
Corresponding angles
e.
Alternate interior angles
f.
Alternate exterior angles