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 62
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 … Fig. 34- It is easily seen that EZ= WZ=a, the side of the square. XZ=aV^\ XE = a(V 2 — 1); XE = WH= WK) XX=a — a(V2 — l) = * (2 — 1/2). Now KZ* = a* + a2 (l/2— 1')» = a2 (4 — 2 V2 ) .-. XZ=tf l/4 — 2i/2. Also GE = XZ—2XE = a\/2 — 2a(V2 — V) = a{2 — j/2).
Geometry · Paper work
Internet Archive · Wellesley College Library · Public domain (published before 1931). Free to use for anything.
