Proofing Problems: Lines & Angles

intersects at so that 1is a right angle. Prove 2 and 3 are complementary. Click 'Check My Answer" below for proofing guide using two-column proof method.

If two lines and intersect at point , prove that .

Given line and a transversal . Prove that the alternate interior angles are congruent.

Given that bisects , prove that .

If line and line , prove that .