A polygon is defined as convex if: 1) all diagonals exist on the interior of the polygon. 2) it is not a circle. 3) at least one diagonal on the exterior of the polygon. 4) all sides are congruent and all angles are congruent.
A convex polygon is defined as a polygon with all its interior angles less than 180°. This means that all the vertices of the polygon will point outwards, away from the interior of the shape. Think of it as a 'bulging' polygon. Note that a triangle (3-gon) is always convex. the answer is 1. http://www.mathopenref.com/polygonconvex.html
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