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# Geometry 3 Theorems

### Chapter 3 Theorems

TermDefinition
If two parallel lines are cut by a third plane Then the lines of intersection are parallel
If two parallel lines are cut by a transversal and alternate interior angles are formed Then they are congruent
If two parallel lines are cut by a transversal and same side interior angles are formed Then they are supplementary
If a transversal is perpendicular to one of two parallel lines Then it is perpendicular to the other one also
If two lines are cut by a transversal and alternate interior angles are congruent or if same side interior angles are supplementary Then the lines are parallel
If two lines are perpendicular to the same line in a plane Then the perpendicular lines are parallel
Through a point outside a line There is exactly one line parallel to and perpendicular to the given line
If two lines are parallel to a third line Then the lines are parallel to each other
The sum of the angles of a triangle 180
The measure of an exterior angle of a triangle Equals the sum of the measures of the two remote interior angles
The sum of the measures of the angles of a convex polygon (n-2)180
The sum of the measures of the exterior angles of any convex polygon 360
Created by: BucsBucs