T. Sundara Row's Geometric exercises in paper folding; (1901)
Sundara Rao, Tandalam, 1853-, Beman, Wooster Woodruff, 1850-1922. ed, Smith, David Eugene, 1860-1944. ed · Chicago, The Open Court Pub. Company; [etc., etc.] · leaf 138
IN PAPER FOLDING 119 Fold NP perpendicular to the axis. Now, in OX take OT=ON'. Take P in RN' so that FP = FT. Fold through P7? cutting NP in i>. Then P and i* are points on the curve. … Fig. 69. 241. iVand N' coincide when PFP is the latus rectum. As N' recedes from F to O, Amoves forward from F to infinity. At the same time, T'moves toward O, and T\OT'= ON) moves in the opposite direction toward infinity. 242. To find the area of a parabola bounded by the axis and an ordinate.…
Geometry · Paper work
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
