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 158
PAPER FOLDING i39 to B on the other side of AB. E is a point of inflec- tion on the curve, the radius of curvature there be- coming infinite. THE OVALS OF CASSINI. 272. When a point moves in a plane so that the product of its distances from two fixed points in the plane is constant, it traces out… … Fig. 82. the curve is rr'=k2, where r and r' are the distances of any point on the curve from the foci and k is a con- stant. Let F and F' be the foci. Fold through F and F'. Bisect FF' in C, and fold BCB' perpendicular to FF'. Find points B and B' such that FB and FB' are each =/£. Then B and B'…
Geometry · Paper work
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
