Angle Congruence Postulate
Two angles are congruent if and only if they have the same measure.
Angle Addition Postulate
part + part = whole
Two angles that make 90 degrees.
Two angles that make 180 degrees.
Linear Pair Postulate
If two angles form a linear pair, then they are supplementary.
An angle whose measure is 90 degrees.
An angle whose measure is less than 90 degrees.
An angle whose measure is greater than 90 degrees.