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= 35 diagonals

Convex and Concave Polygons
The polygons which have all the diagonals inside the figure are known as a Convex
Polygon.

The polygons which have some of its diagonals outside the figure also are known as
a Concave Polygon.

Convex polygon concave polygon

Regular and Irregular Polygons
Polygons which are equiangular and equilateral are called Regular Polygons i.e. a
polygon is regular if-

 It’s all sides are equal (equilateral)

 It’s all angles are equal (equiangular)

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