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 93
IN PAPER FOLDING 73 FOE have the same altitude, and OF bisects the angle EOC, A COE CE OC+ OE A FOE FE OE and OE = OA, . OC OE AAOE _ and OA=OH^ A A OH* A COE a A OE + a A OH A FOE AAOH t) t> A' \_ A From this equation we easily obtain - — X 2AB … 136. Given the radius F and apothem r of a reg- ular polygon, to find the radius R' and apothem r of a regular polygon of the same perimeter but of double the number of sides. . „. Let AB be a side of the first polygon, 0 its center, OA the radius of the circumscribed circle, and OD the apothem..…
Geometry · Paper work
Internet Archive · Wellesley College Library · Public domain (published before 1931). Free to use for anything.
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