sentences:  A "regular hexacontagon" is represented by Schläfli symbol {60} and also can be constructed as a truncated triacontagon, t{30}, or a twice-truncated pentadecagon, tt{15}.A truncated hexacontagon, t{60}, is a 120-gon, {120}.One interior angle in a regular hexacontagon is 174°, meaning that one exterior angle would be 6°.