11D Angles formed by Parallel Lines and a Transversal

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two parallel lines.

Front

Identify a pair of alternate interior angles in a diagram of parallel lines cut by a transversal.

Back

For example, if the angles are labeled as ∠2 and ∠7, they are alternate interior angles.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines in relation to a transversal.

Front

Identify a pair of corresponding angles in a diagram of parallel lines cut by a transversal.

Back

For example, if the angles are labeled as ∠1 and ∠6, they are corresponding angles.

Front

What are vertical angles?

Back

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

Front

Identify the vertical angle to angle 4 in a diagram of intersecting lines.

Back

The vertical angle to angle 4 is angle 8.

Front

What are same-side interior angles?

Back

Angles that are on the same side of the transversal and inside the two parallel lines.

Front

Identify a pair of same-side interior angles in a diagram of parallel lines cut by a transversal.

Back

For example, if the angles are labeled as ∠3 and ∠5, they are same-side interior angles.

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of the transversal and outside the two parallel lines.

Front

Identify a pair of alternate exterior angles in a diagram of parallel lines cut by a transversal.

Back

For example, if the angles are labeled as ∠1 and ∠8, they are alternate exterior angles.