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interior angle
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Tweet n. 1. Any of the four angles formed between two straight lines intersected by a third straight line. 2. An angle formed inside a polygon by two adjacent sides.  (click for a larger image) interior angleAngles 3, 4, 5, and 6 are interior angles. Angles 3 and 6 are alternate interior angles, as are angles 4 and 5. |
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