Definition of

Alternate Interior Angles

Alternate Interior Angles
When two lines are crossed by another line (the Transversal), a pair of angles
• on the inner side of each of those two lines
• on opposite sides of the transversal
are called Alternate Interior Angles.

c and f are Alternate Interior Angles.
d and e are Alternate Interior Angles.

So there are actually two pairs!

Click on "Alternate Interior Angles" below to see.

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