T. Sundara Row's geometric exercises in paper folding. Edited and rev. by Wooster Woodruff Beman and David Eugene Smith (1901)
Sundara Rao, Tandalam, 1853-, Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Chicago Open Court Pub. Co · leaf 87
. .at B\, B2, B3. . . .respectively,at right angles. Then B\, B2, Bd....are the mid-points of the respective chords. Then AA\, AA2,AA3, AA\.. . .are the sides of the inscribed polygons of 22, 23, 24 sides respectively, and OBx, OB2 are the respective apothems. Let OA = R, a (2) represent the side… … 0 A, Fig- 47- For the octagon, in the two triangles ABiO and AB\A<i AB2 OA B~{A2 ~ ~ AAi. %AA£=R-BiA* = £[R — b(2?y\ ^l^) =^2-(2 — 1/2), or ^^2 = ^1/ 2— i/2=a(23) (1) IN PAPER FOLDING 69 /(2») = i?-2»l/ 2 — i/2 (2) t>(23)=OB-2=VOA* — AB-P=\R1 (1 >f 2 — 1/2 -=i?-22-l/2 —1/2 -17? l/2 + l/2=…
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
