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Hak cipta © 2009

Consecutive Interior Angles

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.

In this example, these are Consecutive Interior Angles:

c and e

d and f

To help you remember: the angle pairs are "Consecutive" (they follow each other), and they are on the "Interior" of the two crossed lines

Parallel Lines

If the two lines being crossed are Parallel Lines, then the Consecutive Interior Angles add up to 180°.

(Click on "Consecutive Interior Angles" to have them highlighted for you.)

Language Note: Also called Co-Interior Angles in the UK and Australia