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14 Cards in this Set
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 Back
Isosceles Triangle Theorem

In an isosceles triangle, the base angles are congruent.


Vertical Angles Theorem

Vertical Angles are congruent.


Alternate Interior Angles Theorem

If the lines are parallel, the alternate interior angles are congruent.


Triangle Sum Theorem

The sum of the measures of the angles of a triangle is 180 degrees.


Third Angle Theorem

If two angles in one triangle are congruent to two angles in another triangle, the third angles are congruent.


Congruent and Supplementary Theorem

If two angles are congruent and supplementary, then each is a right angle.


Supplements of Congruent Angles Theorem

Supplements of Congruent angles are congruent.


Right Angles are Congruent Theorem

All right angles are congruent.


Converse of the AIA Theorem

If two lines are cut by a transversal forming congruent alternate interior angles, then the lines are parallel.


AEA Theorem

If two parallel lines are cut by a transversal, then the alternate exterior angles are congruent.


Converse of the AEA Theorem

If two lines are cut by a transversal forming congruent alternate exterior angles, then the lines are parallel.


Interior Supplements Theorem

If two parallel lines are cut by a transversal, then the interior angles on the same side of the transversal are supplementary.


Converse of the Interior Supplements Theorem

If two lines are cut by a transversal forming interior angles on the same side of the transversal that are supplementary, then the lines are parallel.


SAA Congruence Theorem

If two angles and the nonincluded side of one triangle are congruent to two angles and the nonincluded side of another triangle, then the triangles are congruent.
