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

What are same side interior angles?

Back

Same side interior angles are pairs of angles that lie on the same side of a transversal and between two parallel lines.

Front

What are alternate interior angles?

Back

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

Front

What are vertical angles?

Back

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

Front

If angle A measures 60 degrees, what is the measure of angle B if A and B are supplementary?

Back

Angle B measures 120 degrees because supplementary angles sum to 180 degrees.

Front

What is the relationship between corresponding angles when two parallel lines are cut by a transversal?

Back

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

Front

If two angles are complementary and one angle measures 30 degrees, what is the measure of the other angle?

Back

The other angle measures 60 degrees because complementary angles sum to 90 degrees.

Front

What is the measure of angle EDB if angle DBE = 90 degrees and angle BED = 75 degrees?

Back

Angle EDB measures 15 degrees.

Front

What type of angles are formed when two parallel lines are cut by a transversal?

Back

Alternate interior angles, alternate exterior angles, corresponding angles, and same side interior angles are formed.

Front

If angle 7 measures 125 degrees, what is the measure of angle 2 if they are same side interior angles?

Back

Angle 2 measures 55 degrees.