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# Proof Vocab

### Geometry

A midpoint divides a line segment into ______________ ________ _________. Two congruent parts.
A bisector divides a line segment into ___________ __________ ________. Two congruent parts.
A bisector divides an angle into ____________ __________ ____________. Two congruent angles.
If two angles form a right angle, then they are _____________. Complementary.
If two angles form a linear pair, then they are ____________. Supplementary.
Interesting lines form __________ ___________. Vertical angles.
Vertical angles are ____________. Congruent.
An altitude in a triangle is _______________ to the side it intersects. Perpendicular.
Perpendicular lines form ________ ___________. Right angles.
All right angles are ______________. Congruent.
A median in a triangle __________ the side it intersects. Bisects.
Supplements of congruent angles are ____________. Congruent.
Complements of congruent angles are ______________. Congruent.
In a triangle, the measure of an exterior angle is equal to the sum of the measures of _________ ___________ ___________. Remote interior angles.
If two sides of a triangle are congruent, then the angles opposite them are ________________. Congruent.
If two angles of a triangle are congruent, then the sides opposite them are _____________. Congruent.
If two parallel lines are cut by a transversal, then corresponding are __________. Congruent.
If two parallel line are cut by a transversal, then alternate interior angles are ______________. Congruent.
If two parallel lines are cut by a transversal, then alternate exterior angles are _____________. Congruent.
If two lines are cut by a transversal and the alternate interior angles are congruent, then the lines are ___________________. Parallel.
If two lines are cut by a transversal and the alternate exterior angles are congruent, then the lines are _____________. Parallel.
If two lines are cut by a transversal and the corresponding angles are congruent, then the lines are _______________. Parallel.
If two lines are cut by a transversal and the same side interior angles are supplementary, then the lines are ______________. Parallel.
If a triangle has two congruent sides, it is _______________. Isosceles.
If a triangle has two congruent angles, then it is _____________. Isosceles.
If a triangle is isosceles, then the base angles are ______________. Congruent.
If a triangle is isosceles, then the legs are _____________. Congruent.
AB=AB. Reflexive property.
If AB=BC and BC=EF, then AB=EF. Transitive property.
If OA=AB, then AB=OA. Symmetric property.
If AB=DF and BC = CD, then AB-BC=DF-CD. Subtraction property.
If AB=DF and BC=CD, then AB + BC= DF + CD. Addition property.
DE + CD = CE and CD= AB, then DE + AB = CE. Substitution property.
Created by: emarciante9