1. Angle Relationships

2. Adjacent angles
Angles in the same plane that have a common vertex and a common side, but no common interior points. 1
Common side! 2
Common vertex

3. two nonadjacent angles formed by two intersecting lines
Vertical angles
two nonadjacent angles formed by two intersecting lines
Vertical angles are congruent. 4 3

4. Linear pair adjacent angles whose noncommon sides are opposite rays
The sum of the measures of the angles in a linear pair is 180. 5 6

5. Symbol:
Perpendicular lines
Special intersecting lines that form right angles (90º)
Perpendicular lines intersect to form 4 right angles.

6. Symbols:
Parallel Lines
Lines are parallel if they are always the same distance apart (called "equidistant"), and will never meet.
Remember: Always the same distance apart and never touching.
Side Note:
No angles are formed when you only have parallel lines!
No touching=no angles!

7. Supplementary angles – 2 angles whose measures have a sum of 180º
Complementary angles – 2 angles whose measures have a sum of 90º
Form a Linear Pair!