What is a transversal
Any line that intersects two or more parallel lines.
Lines in the same plane that never intersect.
What are parallel lines?
Two angles are congruent. The measure of the first angles is 42 degrees, what is the measure of the second angle
What is 42
These angles add up to 180°—what are they called?
What are supplementary angles?
True or False?
If you know one angle, you can determine the other seven angles when the lines are parallel.
What is true?
What are supplementary angles?
Two angles whose measures add up to 180 degrees
Linear Pair
What are two angles that are adjacent and form a line (180)?
What is the angle relationship name between angles 3 and 6 ? 
What are Alternate Interior Angles?
One way to prove lines are parallel is to show that corresponding angles are what?
What is congruent?
When 2 parallel lines are cut by a transversal, how many different angle measures appear?
What is 2?
When 2 parallel lines are both intersected by a transversal, these angles occupy the same position on the top and bottom parallel lines.
What are Corresponding Angles.
Supplementary Angles
What are two angles that add to 180o?
If the measure of angle 4 is 112, what is the measure of angle 6? 
What is 68. (same-side interior angles)?
To prove lines are parallel, same-side interior angles must be __________.
What is supplementary?
If ∠1=5x-4 and ∠2=3x+20 are same-side interior angles, write an equation that could be used to solve for x.
What is 5x – 4 + 3x + 20 = 180?
What are vertical angles?
Congruent angles formed by two intersecting lines. These angles are located across from each other.
Alternate Exterior Angles
If two parallel lines are intersected by a transversal, these angles are located on the outside of the two parallel lines on opposite sides of the transversal.
Besides vertical angles, this angle pair does not require parallel lines; its two angles are always supplementary and form a straight line.
What is a linear pair?
If the measure of angle 4 is 30 degrees , what is the measure of angle 6? 
What is 150?
If ∠A = 4x + 6 and ∠B = 2x + 26 and the two angles are corresponding, write the equation that could be used to solve for x if the lines are parallel.
What is 4x + 6 = 2x + 26?
What are Alternate Interior Angles?
When 2 parallel lines are both intersected by a transversal these angles are inside of the two parallel lines and on opposite sides of the transversal.
Same-side angles (consecutive)
If two parallel lines are cut by a transversal, these angles are on the inside of the two parallel lines and on the same side of the transversal.
These angles remain congruent even when the lines they come from are not parallel.
What are vertical angles?
Given that angle 2 is 82 degrees, what is the measure of angle 4?
What is 98 degrees?
If ∠1 = 7x – 1 and ∠8 = 4x + 26 are supplementary angles, write an equation that could be used to solve for x.
What is 7x – 1 + 4x + 26 = 180?