How can we help?

You can also find more resources in our Help Center.

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