Download Angle Relationships - Riverdale Middle School

Angle Relationships
Adjacent angles
 Angles
in the same plane that
have a common vertex and a
common side, but no common
interior points.
Common
vertex
1 2
Common side!
Vertical angles
 two
nonadjacent angles
formed by two intersecting
lines
3
 Vertical
4
angles are congruent.
Linear pair
 adjacent
angles whose
noncommon sides are opposite
rays
5
6
 The
sum of the measures of the
angles in a linear pair is 180.
Perpendicular lines
Symbol:
 Special
intersecting lines that
form right angles (90º)
 Perpendicular
lines intersect to
form 4 right angles.
Symbols:
Parallel Lines

Lines are parallel if they are always the
same distance apart (called "equidistant"),
and will never meet.
Side Note:
No angles are formed
when you only have
parallel lines!
No touching=no angles!

Remember: Always the same
distance apart and never touching.
angles – 2 angles
whose measures have a sum of
180º
 Supplementary
Form a
Linear Pair!
angles – 2
angles whose measures have a
sum of 90º
 Complementary