Always, Sometimes, Never: Angles
An acute angle's measure is greater than its supplement
Never
Both angles in a linear pair are obtuse
Never
The angles of a linear pair are complementary
Never
Two vertical angles are NOT congruent
Never
A pair of adjacent angles forms a linear pair
Sometimes
Adjacent angles are congruent
Sometimes
Both of the angles that form a linear pair have the same supplement
Sometimes
Supplementary angles form a linear pair
Sometimes
The two angles that form a linear pair are congruent
Sometimes
When two lines intersect, then all four angles that are formed are congruent
Sometimes
If two lines are perpendicular, then they form at least one pair of congruent angles
Always
If two lines intersect at a right angle, then they form at least one linear pair
Always
Two angles that form a right angle are complementary
Always
Vertical Angles have congruent supplements
Always
A pair of perpendicular lines forms one pair of acute vertical angles and one pair of obtuse vertical angles
Never
An acute angle and its supplement are congruent
Never