Geometry Angle Relationships

Front

What are complementary angles?

Back

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

Front

What are vertical angles?

Back

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

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 at each intersection where a straight line crosses two others. They are equal when the lines are parallel.

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

If two angles are supplementary, what is their relationship?

Back

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

Front

How do you find the measure of an unknown angle if you know one angle in a complementary pair?

Back

Subtract the known angle from 90 degrees.

Front

What is the measure of an angle that is supplementary to a 70 degree angle?

Back

110 degrees, because 180 - 70 = 110.

Front

If angle 4 and angle 6 are alternate interior angles, what can be said about their measures?

Back

Angle 4 and angle 6 are equal in measure.

Front

What is the definition of same-side interior angles?

Back

Same-side interior angles are the pairs of angles on the same side of the transversal and inside the two lines. They are supplementary when the lines are parallel.