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 92
nAA0E, B = 4uaE0E. The triangles A OH and AOE are of the same alti-tude, AH, A AOH OH aAOE OE Similarly, A AOEACOE OA oc Again because AB || CD, A A OH A AOE AAOE aCOE .-.— = — , or A = VA~B.A B Now to find B. Because the triangles COE and IN PAPER FOLDING 73 FOE have the same altitude, and OF… … 136. Given the radius R and apothem r of a reg-ular polygon, to find the radius R and apothem r ofa regular polygon of the same perimeter but of doublethe number of sides. Let AB be a side of the first polygon, 0 its center,OA the radius of the circumscribed circle, and ODthe apothem. On OD…
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
