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triangle and trrapezium
The only polygon with no diagonal is the triangle.
You need to draw one diagonal. Look at the hexagon and then look at a pentagon. The triangle should stand out pretty well then.
Draw a straight line segment connecting two opposite corners of one of the rectangular faces (a diagonal).
Because it has only 3 sides and a polygon must have 4 or more sides to have diagonals. A diagonal of a polygon is a line segment which connects two non-adjacent vertices. Since from any vertex of a triangle, you are adjacent to both of the other vertex, there are not any non-adjacent vertices.