T. Sundara Row's Geometric exercises in paper folding (1905)
Sundara Rao, T. (Tandalam), b. 1853, Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Chicago : Open Court · leaf 162
GEOMETRIC EXERCISES I42 cVe=y+Vy2 — c2. V y2 — c2 is found by taking the geometric mean be- tween y -|- c and y — c. THE CARDIOID OR HEART-SHAPED CURVE. 276. From a fixed point Cona circle of radius a draw a pencil of lines and take off on each ray, meas- ured both ways from the circumference, a… … Fig. 83. The equation to the curve is r = a(l -J- cos 0). The origin is a cusp on the curve. The cardioid is the inverse of the parabola with reference to its focus as center of inversion. THE LIMACON. 277. From a fixed point on a circle, draw a num- ber of chords, and take off a constant length on…
Geometry · Paper work
Internet Archive · Wellesley College Library · Public domain (published before 1931). Free to use for anything.
