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 Interactive Checkpoint
 Exterior Angle:  An exterior angle of a polygon is formed when you extend a side of a polygon. Also, when a third line (a transversal) crosses two other lines, the angles formed outside the other two lines are called exterior angles. (see alternate exterior angles)

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

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

Enter each answer in the left column followed by pressing tab
a)   
b)