Angle & Parallel Lines

Front

What is the definition of parallel lines?

Back

Parallel lines are lines in a plane that never meet; they are always the same distance apart.

Front

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

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on two parallel lines cut by a transversal.

Front

What is the relationship between alternate interior angles?

Back

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

Front

If two lines are cut by a transversal and the alternate exterior angles are equal, what can be said about the lines?

Back

The lines are parallel.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

What is the definition of vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect; they are always equal.

Front

If angle 1 is 70 degrees, what is the measure of angle 3 if angle 1 and angle 3 are corresponding angles?

Back

Angle 3 is also 70 degrees.

Front

What is the definition of a transversal?

Back

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

Front

If two parallel lines are cut by a transversal, what is the relationship between the same-side interior angles?

Back

The same-side interior angles are supplementary, meaning they add up to 180 degrees.