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 are supplementary angles?

Back

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

Front

What is the relationship between alternate interior angles?

Back

Alternate interior angles are equal when two parallel lines are cut by a transversal.

Front

What are corresponding angles?

Back

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

Front

What is the sum of the angles in a triangle?

Back

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

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

If ∠A and ∠B are supplementary and ∠A = 70°, what is ∠B?

Back

∠B = 110° (since 180° - 70° = 110°).

Front

If ∠C and ∠D are complementary and ∠C = 30°, what is ∠D?

Back

∠D = 60° (since 90° - 30° = 60°).

Front

What is the measure of vertical angles?

Back

Vertical angles are always equal in measure.

Front

If two angles are alternate exterior angles, what can be said about their measures?

Back

If the lines are parallel, alternate exterior angles are equal.