A pentagonal tiling which vertices are labeled/labelled A, B, C, D and E.
C^+E^=180°\hat{C} + \hat{E} = 180\degree
A^+B^+D^=360°\hat{A} + \hat{B} + \hat{D} = 360\degree
CD=AE\overline{CD}=\overline{AE}

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