Equilateral Pentagon That Tiles The Plane
With Two Consecutive Complementary to 180 Angles
A+E = 180 & A = 80

Consecutive angles sum = 180
Area = 1.417820+

This pentagon allows a tiling with an order 6 rotational symmetry. It was known to the ancients. The tiling below can continue to infinity.

cc180c tiling

This pentagon allows other periodic tilings:

cc180c tiling

cc180c tiling


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