Angle
Formed by two rays with the same endpoint
Acute Angle
angle between 1 and 89 degrees
Obtuse angle
angle between 91 and 179
right angle
x=90
straight angle
x=180
congruent angles
angles with the same measure
vertical angles
2 angles whose sides are opposite rays
adjacent angles
2 coplanar angles with a common side, a common vertex, and no common interior points
complimentary angles
2 angles which have a sum of 90 degrees
supplementary angles
2 angles whose sum is 180