Parallel lines cut by a transversal Warm-Up

Front

What are Vertical Angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What are Alternate Interior Angles?

Back

Alternate interior angles are pairs of angles that lie between two parallel lines and on opposite sides of a transversal. They are equal.

Front

What are Corresponding Angles?

Back

Corresponding angles are pairs of angles that are in the same position on two parallel lines in relation to a transversal. They are equal.

Front

What are Consecutive Interior Angles?

Back

Consecutive interior angles are pairs of angles that lie on the same side of the transversal and between the two parallel lines. They are supplementary.

Front

What is a Transversal?

Back

A transversal is a line that intersects two or more lines at different points.

Front

What are Supplementary Angles?

Back

Supplementary angles are two angles whose measures add up to 180°.

Front

What is the relationship between Alternate Exterior Angles?

Back

Alternate exterior angles are pairs of angles that lie outside two parallel lines and on opposite sides of a transversal. They are equal.

Front

How do you identify Corresponding Angles?

Back

Corresponding angles can be identified as angles that occupy the same relative position at each intersection where a straight line crosses two others.

Front

What is the sum of the measures of Vertical Angles?

Back

The measures of vertical angles are always equal, so if one angle measures 50°, the other also measures 50°.

Front

What is the relationship between Consecutive Interior Angles?

Back

Consecutive interior angles are supplementary, meaning their measures add up to 180°.