Angle Relationships

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 are Alternate Interior Angles?

Back

Alternate interior angles are pairs of angles formed when a transversal crosses two parallel lines, located on opposite sides of the transversal and inside the two lines. They are equal.

Front

What are Alternate Exterior Angles?

Back

Alternate exterior angles are pairs of angles formed when a transversal crosses two parallel lines, located on opposite sides of the transversal and outside the two lines. They are equal.

Front

What are Corresponding Angles?

Back

Corresponding angles are pairs of angles formed when a transversal crosses two parallel lines, located on the same side of the transversal and in corresponding positions. They are equal.

Front

What is the sum of the measures of angles in a triangle?

Back

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

Front

If two angles are complementary, what is their sum?

Back

If two angles are complementary, their sum is 90 degrees.

Front

What is the value of 'a' if angle 1 is 75° and angle 2 is supplementary to angle 1?

Back

The value of 'a' is 105° because 180° - 75° = 105°.

Front

If angle 3 is 20° and angle 4 is vertical to angle 3, what is the measure of angle 4?

Back

Angle 4 is also 20° because vertical angles are equal.

Front

What is the relationship between angle 5 and angle 6 if they are alternate interior angles?

Back

Angle 5 and angle 6 are equal in measure.