Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Boston, Ginn & company · leaf 233
OX be the perpendicular bisector of line-segment AB at 0 ;lay off on OX, OD = AO ; and, on DX, lay off DC = DB ; then provethat C is the center of the O circumscribed about the regular octagon ofwhich AB is a side. 216 PLANE GEOMETRY. [Bk. V. 4. THE MENSURATION OF THE CIRCLE. 296. Postulate of… … The following may be read by the student in connectionwith the postulate, although it does not constitute a proof: 1. In the figure, suppose an in- and circumscribed regular ?i-gon rep- 360°resented. Then each exterior angle equals in each figure. 360° 180° 2. .-. each interior angle equals 180°…
Geometry
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