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