###
Sometimes

If two angles are supplementary to the same angle, then they are supplementary to each other.

###
Never

Parallel lines are cut by a transversal and alternate interior angles are not congruent.

###
Always

Passing through a point not on line l, there exists exactly one line perpendicular to line l.

###
Always

Passing through point P not on line l, there exists exactly one line parallel to line l.

###
Sometimes

the converse of a theorem is true

###
Always

A theorem can be proven

###
Always

Two intersecting lines are coplanar

###
Sometimes

Supplementary angles form a linear pair

###
Sometimes

If line 1 is in plane X and line 2 is in plane Y and X is parallel to Y, then line 1 is parallel to line 2.

###
Always

If points M and N are on line PQ and line PM is congruent to line NQ, then line PN is congruent to line MQ

###
Always

An isosceles triangle __________ has exactly two congruent angles

###
Always

An equilateral triangle is _________ an equiangular triangle

###
Sometimes

A point that is equidistant from the endpoints of a segment _________ lies on a perpendicular bisector of that segment

###
Always

The measure of an exterior angle of a triangle is ________ equal to the sum of the measures of two interior angles

###
Sometimes

Alternate interior angles are ___________ congruent

###
Always

Vertical angles are __________ congruent by definition

###
Sometimes

Parallel segments are ________ congruent

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