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| in·te·ri·or an·gle (plural in·te·ri·or an·gles) |
noun |
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1. angle inside a polygon: the angle formed between two adjacent sides of a polygon and lying in its interior. The sum of the interior angles of any polygon is equal to the number of its sides minus two and multiplied by 180º.
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2. angle within intersecting lines: any of the four angles formed in the area between two parallel lines by a third line that intersects them transversal
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