Lines and Angles

Perpendicular Lines

Parallel Lines

Proving Lines are Parallel

Properties of Parallel Lines

100

A line that cuts through 2 or more lines at different points

Transversal

100

The symbol for perpendicular

Upside down capital T

100

The symbol for parallel

ll

100

True or False: Sometimes there is not enough information to prove that lines are parallel.

True

100

If two lines are perpendicular to the same line, what can one conclude?

The two lines are parallel.

200

Two lines that are not coplanar and never intersect

Skew

200

If two lines are perpendicular to one another, this is the number of right angles that are created.

4

200

Another word for same-side interior angles

Consecutive interior angles

200

If the lines being cut by a transversal are going to be parallel, and one angle is 40 degrees, the corresponding angle is going to be ___.

40 degrees

200

If a line is parallel to a given line, and another line is parallel to that given line, the three lines have to be ____.

Parallel

300

The top and bottom of a box would be defined as _________________ ________________.

Parallel planes

300

The word used for two angles whose sum is 90 degrees.

Complementary

300

If two parallel lines are cut by a transversal, the corresponding angles will always and forever be _____.

Congruent

300

True or False : If vertical angles are congruent, the lines cut by a transversal must be parallel.

False

300

When the transversal is perpendicular to two parallel lines, what is the angle of the alternate exterior angles?

90 degrees

400

Corresponding Angles are a pair of angles that are in the _________________ __________________.

Same position

400

If a linear pair is made of two congruent angles, then each angle is _____.

90 degrees

400

The symbol for congruent

The equal sign with a squiggle on top

400

When looking at same-side interior angles, if the two angles add up to equal 180, what can you conclude?

The two lines are parallel

400

When a transversal is perpendicular to a pair of parallel lines, what will the same-side interior angles be?

Supplementary

500

If a pair of angles are on opposite sides of a transversal and are contained between two lines, they would be classified as ___________.

Alternate Interior Angles

500

Perpendicular lines have ______ point(s) of intersection.

1

500

Same-side exterior angles will always be ______.

Supplementary

500

Fix the error: If two alternate exterior angles are supplementary, then the two lines being cut by the transversal are parallel.

If two alternate exterior angles are CONGRUENT...

500

If a transversal cuts through a pair of parallel lines and one of the same-side interior angles is 54, what must the other angle measure?

126 degrees