T. Sundara Row's geometric exercises in paper folding. Edited and rev. by Wooster Woodruff Beman and David Eugene Smith (1901)
Sundara Rao, Tandalam, 1853-, Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Chicago Open Court Pub. Co · leaf 64
—7k2, and HA = ^ l/20 —14i/2. 94. The area of the octagon is eight times thearea of the triangle HO A, 7 l/2 = ^<92-2i/2 a y(2-l/2) 2i/2 ^ = ^--2|/2-(6 —4i/2)4 = a2-(31/2 — 4) = a2-l/2-(V/2 — l)2. 44 GEOMETRIC EXERCISES 95. This octagon : the octagon in § 92 = (2 —1/2 )2 : 1 or 2 : (V2 + l)2;and… … Fig. 35- Obtain the three equal angles at the center of anequilateral triangle. (§ 25.) 46 GEOMETRIC EXERCISES For convenience of folding, cut out the threeangles, A OF, FOC, and CO A. Trisect each of the angles as in Fig. 35, and makeeach of the arms = OA. 97. Each of the angles of a nonagon is…
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
