Triangle Sum / Similar Triangles

Front

What is the Triangle Sum Theorem?

Back

The Triangle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

If one angle of a triangle measures 90 degrees, what can you say about the other two angles?

Back

The other two angles must sum to 90 degrees, making the triangle a right triangle.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of a transversal and inside two parallel lines.

Front

If two angles are congruent, what does that mean?

Back

It means that the two angles have the same measure.

Front

What is the measure of angle <5 if angle <3 = 120 degrees?

Back

Angle <5 also measures 120 degrees.

Front

Name a pair of same side interior angles in a transversal situation.

Back

Angles <3 and <6 are same side interior angles.

Front

If angle

Back

Angle

Front

What is the relationship between vertical angles?

Back

Vertical angles are always congruent, meaning they have the same measure.

Front

If angle

Back

Angle

Front

Why are angles

Back

They are alternate exterior angles formed on parallel lines cut by a transversal.