Segment and Angle Proofs

Two angles are complementary if the sum of their measures is $$90^\text{degree}$$ .

Two angles are supplementary if the sum of their measures is $$180^\text{degree}$$ .

If point O is between points F and X, then $$FO + OX = FX$$ .

A right angle is an angle that measures exactly $$90^\text{degree}$$ .

A linear pair consists of two adjacent angles whose non-common sides form a straight line, and their measures add up to $$180^\text{degree}$$ .

A straight angle is an angle that measures exactly $$180^\text{degree}$$ .

The Reflexive Property states that any geometric figure is congruent to itself.

If two quantities are equal, one can be substituted for the other in any expression.

Segments that have the same length are called congruent segments.

Vertical angles are congruent; if two angles are opposite each other when two lines intersect, they are equal in measure.