1. Curve :
(i). Open Curve :
(ii). Closed Curve :
(iii). Simple Closed Curve :
2. Polygons :
(i). Concave Polygon :
(ii). Convex Polygon :
3. Regular Polygon :
4. Irregular Polygon :
5. For a Regular Polygon of n Sides :
6. In a convex Polygon of n sides :
7. Number of diagonal in a polygon of n sides :
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