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Pentagonal Tiling 13

A pentagonal tiling which vertices are labeled/labelled A, B, C, D and E.
B^=90°\hat{B} = 90\degree
E^=90°\hat{E} = 90\degree
2A^+D^=360°2\hat{A} + \hat{D} = 360\degree
(2C^+D^=360°)\left(2\hat{C} + \hat{D} = 360\degree\right)
CD=2AE=2DE\overline{CD} = 2\overline{AE} = 2\overline{DE}

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