Parallel Lines and Triangles

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees

Front

If two parallel lines are cut by a transversal, what is the relationship between the corresponding angles?

Back

They are congruent.

Front

What is the measure of the missing angle if one angle is 39 degrees and the other is 101 degrees?

Back

The missing angle is 40 degrees.

Front

What do you call angles that are on the same side of the transversal and inside the parallel lines?

Back

Same side interior angles.

Front

If two angles are supplementary, what is the sum of their measures?

Back

180 degrees.

Front

What is the measure of an angle that is supplementary to a 89-degree angle?

Back

91 degrees.

Front

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

Back

They are congruent.

Front

If one angle measures 40 degrees, what is the measure of its corresponding angle when two parallel lines are cut by a transversal?

Back

40 degrees.

Front

What is the measure of an angle that is complementary to a 39-degree angle?

Back

51 degrees.

Front

What do you call angles that are opposite each other when two lines intersect?

Back

Vertical angles.