... BC, CD, DE, EF and FA; and the figure ABCDEF is an equilateral and equiangular hexagon inscribed in the given circle. ... 4. is proved that the triangle AGF is equilateral, and the Pa#39;AdP- 32angle AGF equal to one-third part of two right angles; 3a#39; 1a#39; but the angles BGA and AGF together with FGE ... Hence it follows that the square of the side of an equilateral triangle is triple the square of the ra(l) Prop.12.
|Title||:||The First Six Books of the Elements of Euclid, with Notes [by T. Elrington]. Eleventh Edition|