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 51
^2- of a rightangle, and they are equal. Therefore each of themis I of a right angle. Therefore all the angles of the pentagon are equal. The pentagon is also equilateral by construction. 72. The base MN oi the pentagon is equal to XB,i. e., to— ■ (l 5 — l)=ABX0.6180.... § 58. The greatest breadth… … Fig. 28. 74. If ^ be the radius of the circumscribed circle,AB 2AB R = 2cosl8°- T/10 + 2t/5 10 = ^^X0.5257.... IN PAPER FOLDING 33 75. If r be the radius of the inscribed circle, thenfrom Fig. 28 it is evident that 5- -l/5 10 I -T/5 511/5 J -R = AB-s^-^ AS •-yl = ABX 0.4253 76. The area of the…
Geometry -- Study and teaching · Paper work
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
