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this works with any shape you can think of like: a square, triangle, pentagon, octagon,hexagon or a decagon. A hexagon is used here. In fact, if you are in a computer drawing program just copy and paste your first shape right next to it.

Summary:
Draw a polygon: Draw an overlapping polygon, roughly the same size and shape. Connect all the corners of the first shape to the congruent corner of the other shape.