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Arrange 5 congruent regular pentagons around a central one. Each of the outer 5 pentagons shares a side with the center pentagon. |
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Arrange 5 congruent regular pentagons around a central one. Each of the outer 5 pentagons shares a side with the center pentagon. |
 
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By folding the extensions on the connecting bases, we can form half of a regular dodecahedron. |
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By duplicating this formation, rotating the duplicate 180°, then again around the vertical axis for 36°, and finally by connecting the two polyhedrons, we form a regular dodecahedron.
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