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 Interactive Checkpoint
 Interior Angle:  An interior angle of a polygon is formed by two adjacent sides. Also, when a third line (a transversal) crosses two other lines, the angles formed in between the other two lines are called interior angles. (see alternate interior angles)

Use three letters to identify two interior angles in quadrilateral ABCD.

Use the less than sign, <, to represent an angle symbol when you input your answer.

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