Parallel lines and triangles

Front

What are parallel lines?

Back

Lines in a plane that never meet and are always the same distance apart.

Front

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

Back

180 degrees.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always congruent.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines cut by a transversal; they are congruent.

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What are congruent angles?

Back

Angles that have the same measure.

Front

If angle A is 40 degrees, what is the measure of its supplementary angle?

Back

140 degrees.

Front

If angle 6 is 25 degrees, what is the measure of angle 7 if they are vertical angles?

Back

25 degrees.

Front

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

Back

60 degrees.

Front

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

Back

They are congruent.