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 67
Fig. 36. The main part of the process is to obtain theangles at the center. In Fig. 36, the radius of the inscribed circle ofthe pentagon is taken for the radius of the circum-scribed circle of the decagon, in order to keep itwithin the square. 48 GEOMETRIC EXERCISES ioo. A regular decagon may also… … Fig. 37- Let YO, and XO produced meet XC, and YD in Cand D respectively. Divide the angles XOC and DOY into four equalparts by HOE, KOF, and LOG. Take Otf, OK, OL, OE, OF, and OG equal toCFor CX Join X, H, K, L, C, D, E, F) G, and Y, in order. IN PAPER FOLDING As in § 60, Z YOX=\ of a rt. / =36°. 49
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
