Angles and parallel lines

Front

What are parallel lines?

Back

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

Front

What is a transversal?

Back

A line that intersects two or more lines at different points.

Front

What are vertical angles?

Back

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

Front

What are alternate exterior angles?

Back

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

Front

What is the sum of angles on a straight line?

Back

180 degrees.

Front

What is the sum of angles in a triangle?

Back

180 degrees.

Front

If m∠A + m∠B + m∠C = 180°, what does this represent?

Back

The angle sum property of triangles.

Front

What is an exterior angle of a triangle?

Back

An angle formed by one side of a triangle and the extension of an adjacent side.