Proving Lines Parallel in Geometry

This video tutorial explains how to prove lines are parallel using angle relationships. It covers the converse of various theorems, such as corresponding angles, alternate interior angles, and consecutive interior angles. The video includes example problems and proofs to illustrate these concepts, emphasizing the importance of understanding angle relationships in geometry. The tutorial concludes with a summary of the key points discussed.

What does the converse of a hypothesis and conclusion mean?

• Switching the statements order

• Keeping the statements the same

• Removing the hypothesis

• Adding new statements

If angle 1 is congruent to angle 3, which lines are parallel?

• Line a and Line b

• Line a and Line c

• Line a and Line d

• Line b and Line c

Tags

CCSS.8.G.A.5

What is the converse of the corresponding angles postulate?

• If corresponding angles are congruent, then the lines are parallel

• If alternate interior angles are congruent, then the lines are parallel

• If consecutive interior angles are supplementary, then the lines are parallel

• If alternate exterior angles are congruent, then the lines are parallel

Tags

CCSS.8.G.A.5

If the measure of angle 2 plus the measure of angle 4 is equal to 180, which lines are parallel?

• Line b and Line d

• Line b and Line c

• Line a and Line b

• Line a and Line c

If angle 1 is 100 degrees and angle 4 is 105 degrees, what can be said about line a and line c?

• They are parallel

• They are congruent

• They are perpendicular

• They are not parallel

Tags

CCSS.8.G.A.5

What is the measure of angle abf if it makes lines g e and d a parallel?

• 120 degrees

• 130 degrees

• 150 degrees

• 140 degrees

Which theorem states that if two lines are perpendicular to the same line, then they are parallel to each other?

• Converse of the corresponding angles postulate

• Converse of the alternate interior angles theorem

• Converse of the perpendicular transversal theorem

• Converse of the consecutive interior angles theorem

Tags

CCSS.8.G.A.5

If angle 1 is congruent to angle 5, which lines are parallel?

• Line a and Line d

• Line a and Line b

• Line b and Line c

• Line a and Line c

Tags

CCSS.8.G.A.5

If angle 2 is congruent to angle 8, which theorem can be used to prove lines are parallel?

• Converse of the corresponding angles postulate

• Converse of the alternate exterior angles theorem

• Converse of the alternate interior angles theorem

• Converse of the consecutive interior angles theorem

Tags

CCSS.8.G.A.5

If angle 1 is congruent to angle 9 and angle 9 is congruent to angle 15, which lines are parallel?

• Both a and b, and c and d

• Line c and Line d

• Line a and Line b

• None of the above

Tags

CCSS.8.G.A.5