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# Consecutive Interior Angles Theorem

Theorems are very important in the world of math. Luckily for us,
other mathematicians have already proved that these theorems are
correct. This means that all we need to do is *apply* these
theorems to solve all kinds of math problems. One example is the
consecutive interior angles theorem. Let's find out how it works:

## The consecutive interior angles theorem defined

The Consecutive Interior Angles Theorem states that:

- When two parallel lines are cut by a transversal, the consecutive interior angles are supplementary.

To clarify the terms:

- A transversal is a line that intersects two other lines.
- Parallel lines are lines that never intersect and maintain an equal distance apart.
- Consecutive interior angles lie on one side of the transversal and inside the parallel lines.
- Supplementary angles are angles that add up to a total of 180 degrees.

So, when two parallel lines are intersected by a transversal, the consecutive interior angles on one side of the transversal add up to 180 degrees.

## Visualizing the consecutive interior angles theorem

To visualize the consecutive interior angles theorem, imagine the following scenario:

We have two parallel lines, a and b. There is also a third line called "t," which is our transversal. This transversal intersects the parallel lines a and b, creating a total of eight angles, numbered from 1 to 8.

The consecutive interior angles lie between the parallel lines a and b, on one side of the transversal t. Let's say angles 3 and 5 are consecutive interior angles on the left side of the transversal, and angles 4 and 6 are consecutive interior angles on the right side of the transversal.

According to the consecutive interior angles theorem, angles 3 and 5 must be supplementary, meaning they add up to 180 degrees. Similarly, angles 4 and 6 must also be supplementary.

The other angles formed by the transversal, which are outside the parallel lines a and b, are called exterior angles.

## Topics related to the Consecutive Interior Angles Theorem

Alternate Interior Angles Theorem

Polygon Interior Angles Sum Theorem

## Flashcards covering the Consecutive Interior Angles Theorem

Common Core: High School - Geometry Flashcards

## Practice tests covering the Consecutive Interior Angles Theorem

Common Core: High School - Geometry Diagnostic Tests

Intermediate Geometry Diagnostic Tests

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