Parallel Lines & Angles

Front

What are Vertical Angles?

Back

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

Front

What is the relationship between Alternate Interior Angles?

Back

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

Front

What are Corresponding Angles?

Back

Corresponding angles are pairs of angles that are in the same position on two different parallel lines cut by a transversal. They are equal in measure.

Front

What are Alternate Exterior Angles?

Back

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

Front

How do you find the measure of an angle if you know its supplementary angle?

Back

The measure of a supplementary angle can be found by subtracting the known angle from 180 degrees.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

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

Back

The angles formed will have specific relationships: corresponding angles are equal, alternate interior angles are equal, and same-side interior angles are supplementary.

Front

What is the measure of an angle that is complementary to a 47-degree angle?

Back

The measure of the complementary angle is 43 degrees, since complementary angles sum to 90 degrees.

Front

What is the definition of a transversal?

Back

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

Front

If angle 3 measures 50 degrees, what is the measure of its alternate interior angle?

Back

The alternate interior angle to angle 3 is also 50 degrees if the lines are parallel.