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# geometry t/p

Theorem 3-1 If two parallel planes are cut by a third plane the lines of intersection are parallel
postulate 10 If two parallel lines are cut by a transversal then the corresponding angles are congruent.
Theorem 3-2 if two parallel lines are cut by a transversal then alternate interior angles are congruent.
theorem 3-3 if two parallel lines are cut by a transversal then the same side interior angles are supplementary.
THeorem 3-4 if a transversal is perpendicular to one of two parallel lines then it is perpendicular two the other one also.
Postulate 10 if two parallel lines are cut by a transversal then corresponding angles are congruent.
postulate 11 if two lines are cut by a transversal and corresponding angles are congruent then the lines are parallel.
theorem 3-5 IF two lines are cut by a transversal and alternate interior angles are congruent then the lines are parallel.
theorem 3-6 If two lines are cut by a transversal and same side interior angles are supplementary then the lines are parallel.
Theorem 3-7 in a plane two lines perpendicular to the same line are parallel.
Theorem 3-8 through a point outside a line there is exactly one line parallel to the given line.
Theorem 3-9 through a point outside a line there is exactly one line perpendicular to the given line
Created by: jazzyjasper