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 129
ting the circle in P and R and BC in Q,then AQ is the harmonic mean and AC ihe geometricmean between AP and AR. 214. Fold a right-angled triangle OCB and CAthe perpendicular on the hypotenuse. Take D in ABsuch that 0D= OC (Fig. G5). Then OA-OB=OC2=OP>2,and OA : OC=OC: OB,OA : OD=OD: OB. no… … Fig. 65. Hence when the center is taken as the origin, thefoot of the ordinate of a point on a circle has for itsinverse the point of intersection of the tangent andthe axis taken. 215. Fold FBG perpendicular to OB. Then theline FBG is called the polar of point A with referenceto the polar circle…
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
