7.1 Parallel Lines and Angles

Front

What are parallel lines?

Back

Lines in a plane that never meet and are always the same distance apart.

Front

What is the sum of the angles in a straight line?

Back

180 degrees.

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

If two angles are supplementary and one angle measures 70 degrees, what is the measure of the other angle?

Back

110 degrees.

Front

If two angles are complementary and one angle measures 30 degrees, what is the measure of the other angle?

Back

60 degrees.

Front

What is the relationship between alternate interior angles when two parallel lines are cut by a transversal?

Back

They are equal.

Front

What is the relationship between corresponding angles when two parallel lines are cut by a transversal?

Back

They are equal.

Front

What is a transversal?

Back

A line that intersects two or more lines in a plane.