Description: Does the polygon commonly used algorithm module 1. judgements polygons whether simple polygon. 2. inspections polygons apex convex-concave. 3. judgements polygons whether raised- polygon. 4. ask the polygon area. 5. judgements polygons apex the arrangement direction, the method 1. 6. judgements polygons apex arrangement direction, the method 2. 7. beams methods to sentence the break point whether. 8. sentences the break point in the polygon whether in raised- polygon
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