## 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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