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 corresponding angles?

Back

Corresponding angles are the angles that are in the same position at each intersection where a straight line crosses two others. They are equal when the lines are parallel.

Front

What are alternate interior angles?

Back

Alternate interior angles are the pairs of angles on opposite sides of the transversal but inside the two lines. They are equal when the lines are parallel.

Front

What are alternate exterior angles?

Back

Alternate exterior angles are the pairs of angles on opposite sides of the transversal but outside the two lines. They are equal when the lines are parallel.

Front

How do you find the measure of a missing angle when two angles are supplementary?

Back

If two angles are supplementary, their measures add up to 180°. To find the missing angle, subtract the known angle from 180°.

Front

How do you find the measure of a missing angle when two angles are complementary?

Back

If two angles are complementary, their measures add up to 90°. To find the missing angle, subtract the known angle from 90°.

Front

What is the sum of the angles in a triangle?

Back

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

Front

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

Back

The angles formed 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 angle 4 if angle 8 is 70° and they are corresponding angles?

Back

Angle 4 is also 70° because corresponding angles are equal.

Front

If angle 1 is 50°, what is the measure of angle 3 if angle 1 and angle 3 are vertical angles?

Back

Angle 3 is also 50° because vertical angles are equal.