Parallel Lines cut by a Transversal

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What are parallel lines?

Back

Parallel lines are lines in a plane that never meet. They are always the same distance apart and have the same slope.

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What is a transversal?

Back

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

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of the transversal and inside the two lines. They are equal when the lines are parallel.

Front

What are same-side interior angles?

Back

Same-side interior angles are pairs of angles that are on the same side of the transversal and inside the two lines. They are supplementary when the lines are parallel.

Front

What is a linear pair of angles?

Back

A linear pair of angles are two adjacent angles formed when two lines intersect. They are supplementary, meaning their measures add up to 180 degrees.

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Back

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Back

Front

What is the sum of the angles in a linear pair?

Back

The sum of the angles in a linear pair is 180 degrees.

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Back

The measure of the alternate interior angle is also 72 degrees.

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Back

The measure of the same-side interior angle is 72 degrees.