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 37
t-angle PL — square PK—square AE, i. e., (a + b)(a — b) = a2 — b2. 50. If squares be described about the diagonal ofa given square, the right angle at one corner beingcommon to them, the lines which join this corner withthe mid-points of the opposite sides of the given i8 GEOMETRIC EXERCISES square… … Fig. 17. superposition. Therefore the mid-points of the sidesof the inner squares must lie on these lines. 51. ABCD being the given square piece of paper(Fig. 18), it is required to obtain by folding, the pointX in AB, such that the rectangle AB-XB is equal tothe square on AX. Double BC upon itself…
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
