A polygon with one more vertex than a triangle, which has three vertices, is a quadrilateral. A quadrilateral has four vertices and includes various shapes like squares, rectangles, and trapezoids. It is characterized by having four sides and four angles.
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A polygon with 2 more side than a triangle is a 5 sided pentagon.
A diagonal is normally defined as a straight line joining a vertex of a polygon with any vertex other than an adjoining vertex (lines joining a vertex to an adjoining vertex would simply be a side of the polygon). Since a triangle has only got adjoining vertices, it has no diagonals. Since there are no diagonals, they cannot bisect one another.
triangle * * * * * A triangle is NOT a 3d shape! A cube.
a pentagon
A polygon must have 3 or more sides as with a triangle for example