3-3 Proving Parallel and Perpendicular Lines

Question 1

corresponding angles post. conv.-

Answer 1

if 2 angles are cut by a transversal,and corresponding angles are congruent, then the lines are parallel

Question 2

same side interior angle converse

Answer 2

if 2 lines are cut by a transversal, and the same side interior angles are supplementary, then the lines are parallel

Question 3

transitive prop. of parallel lines theorem

Answer 3

in a plane, is 2 lines are parallel to the same line, then there parallel to the same line.

Question 4

lines perp. to a transversal theorem

Answer 4

in a plane if 2 lines are perp. to the same line, then they are parallel to each other.

Question 5

perp. transversal theorem

Answer 5

in a plane, if a line is perpendicular to one of the two parallel lines, then its also perpendicular to the other.