Angle relationships

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of a transversal and outside the two lines it intersects.

Front

What are complementary angles?

Back

Angles that add up to 90°.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always congruent (equal in measure).

Front

What are corresponding angles?

Back

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

Front

If angle ∠ABD is 67°, what is ∠DBC if they are supplementary?

Back

23° (since supplementary angles add up to 180°).

Front

What is the sum of the angles in a triangle?

Back

180°.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of a transversal and inside the two lines it intersects; they are congruent if the lines are parallel.

Front

What is the definition of supplementary angles?

Back

Angles that add up to 180°.

Front

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

Back

60° (since 30° + 60° = 90°).

Front

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

Back

They are congruent (equal in measure).