Cumulative #3: Parallel & Perp. Lines; Congruent Triangles

Front

What are parallel lines?

Back

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

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What are congruent triangles?

Back

Triangles that have the same size and shape; corresponding sides and angles are equal.

Front

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

Back

180 degrees.

Front

What are complementary angles?

Back

Angles that add up to 90 degrees.

Front

What are supplementary angles?

Back

Angles that add up to 180 degrees.

Front

What are vertical angles?

Back

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

Front

What are corresponding angles?

Back

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

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two lines; they are equal if the lines are parallel.

Front

What are same side interior angles?

Back

Angles that are on the same side of the transversal and inside the two lines; they are supplementary if the lines are parallel.