When two lines are crossed by another line (which is called the Transversal), the pairs of angles:

• on one side of the transversal

• but inside the two lines

are called Consecutive Interior Angles.

When the two lines are parallel the Consecutive Interior Angles add to 180 degrees.

Click on "Consecutive Interior Angles" below to see.

• on one side of the transversal

• but inside the two lines

are called Consecutive Interior Angles.

When the two lines are parallel the Consecutive Interior Angles add to 180 degrees.

Click on "Consecutive Interior Angles" below to see.