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 61
GEOMETRIC EXERCISES 42 93. A regular octagon may also be obtained by dividing the angles of the given square into four equal parts. 2 Y … w K X Fig. 34- It is easily seen that EZ— WZ—a, the side of the square. XZ—aV^; XE = WH=WK; XX=a — a(V'2 — l) = a(2 —1/2). Now KZ* = a* + «2(l/2 — l)2 = a?(4 — 2l/2) .-. ^z=a 1/4—21/2. Also G£ = XZ—2XE = aV/2 — 2a(l/2 — 1) = a(2—1/2).
Geometry · Paper work
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
