Angles of Parallel Lines

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of a transversal and inside the two parallel lines. They are congruent when the lines are parallel.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines cut by a transversal. They are congruent.

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of a transversal and outside the two parallel lines. They are congruent when the lines are parallel.

Front

What is a transversal?

Back

A line that intersects two or more lines at distinct points.

Front

What is the relationship between parallel lines and angles formed by a transversal?

Back

When a transversal intersects parallel lines, several pairs of angles are formed that have specific relationships (congruent or supplementary).

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect. They are always congruent.

Front

If two parallel lines are cut by a transversal, what can be said about the alternate interior angles?

Back

They are congruent.

Front

If two parallel lines are cut by a transversal, what can be said about the corresponding angles?

Back

They are congruent.

Front

If two parallel lines are cut by a transversal, what can be said about the same-side interior angles?

Back

They are supplementary (their sum is 180 degrees).

Front

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

Back

180 degrees.