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 41
80... .x<*. 59. In the language of proportion AB : ^X=^X: X^. The straight line AB is said to be divided in ex-treme and mean ratio. 60. Let AB be divided in X in median section.Complete the rectangle CBXH (Fig. 19). Bisect therectangle by the line MNO. Find the point N bylaying XA over X so… … Fig. 19. Z ABN= 2 / NAB. ANi = MN2-\-AM2 = ^2 and IN PAPER FOLDING .-. AN=AB /_NAB = \ of a right angle. 23 61. The right angle at A can be divided into fiveequal parts as in Fig. 20. Here N is found as in§60. Then io\& ANQ; bisect iQAB by folding,
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
