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The exterior angle, D, is supplementary to the adjacent interior angle, C. Together, they form a straight line, measuring 180°. The measure of the remote interior angles, A and B are equal to the measure of the exterior angle D.
m∠2 = 30✔ 6090 degrees
m∠4 = 120✔ 150180 degrees
m∠6 = 3060✔ 90 degrees
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