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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 61

An illustration from T. Sundara Row's geometric exercises in paper folding. Edited and rev. by Wooster Woodruff Beman and David Eugene Smith, 1901, leaf 61
angle AEK, AEi^ARi + KE? a2 a2 = T + ^(3-22) IN PAPER FOLDING 4i = ~- (4-21/2) « = _.(2_1/2). ..A£=j • l/2—i/2. 91. The altitude of the octagon is CE (Fig. 33).But CE* = AC2 — AE? = a*- £ • (2_i/2) = f!.(2 + 1/2). ^/^^// \x/^^V// K 0/ k\A / Fig. 33. .-. C£ = ^ I/2 + I/2. 92. The area of the octagon… … w Fig. 34- It is easily seen that EZ = WZ = a, the side of thesquare. XZ=a\/2;X£ = a(}/2 — l);XE = WH= WK;XX=a—a(y2 — l)= a (2—1/2). Now KZ* = ai + «2(1/2 — l)2 = a>(4 —2l/2).-. KZ=a 1/4 — 21/2.Also GE = XZ—2XE = av2 — 2a{V2 — \)= a(2 — V2). IN PAPER FOLDING 43 .-. H0=^ (2—l/2). Again 0Z=^V2,and…

Geometry -- Study and teaching · Paper work

Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.

More pictures from T. Sundara Row's geometric exercises in paper folding. Edited and rev. by Wooster Woodruff Beman and David Eugene Smith

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