1 2 Ball, Derek (2002), "Equiangular polygons", The Mathematical Gazette, 86 (507): 396–407, JSTOR 3621131 . ↑ Elias Abboud "On Viviani’s Theorem and its Extensions" pp. 2, 11 ↑ De Villiers, Michael, "Equiangular cyclic and equilateral circumscribed polygons", Mathematical Gazette 95, March 2011, 102-107. ↑ McLean, K. Robin.