Download Angle Notes - Leon County Schools

Angle Notes:
Parallel lines- travel in same direction and
will never touch.
Transversal – a straight line that crosses
at least 2 other lines
Complementary angles- add up to 90o, if
they are adjacent (sharing a side)- they
form a right angle.
Supplementary angles- add up to 180o, if
they are adjacent (sharing a side)- they
form a straight line.
Corresponding Angles- When two lines
are crossed by another line, the angles in
matching corners are called corresponding
angles. When the two lines are parallel
Corresponding Angles are equal.
When two lines are crossed by another line
(called the Transversal): The pairs of
angles on opposite sides of the transversal
but inside the two lines are called
Alternate Interior Angles.
When two lines are crossed by another
line, the pairs of angles on opposite sides
of the transversal but outside the two lines
are called Alternate Exterior Angles.
Same side interior angles are two angles
that are on the same side of the
transversal and on the interior of the two
lines. Same Side Interior Angles Theorem:
If two parallel lines are cut by a transversal,
then the same side interior angles are
supplementary.
Vertical Angles are the angles opposite
each other when two lines cross. They are
always equal. "Vertical" in this case means
they share the same Vertex (corner point)