A co-exterior angle is almost the same thing as co-interior : two angles on the same side of the transversal in a figure where two parallel lines are intersected by transversal . The are supplementary angles add up to 180°. They are exterior angles meaning they are outside of the two parallel lines opposite to interior angles which are two parallel lines.
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Angles which sum up to 180 (on the same side of the traversal are called co exterior angles.
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