T. Sundara Row's Geometric exercises in paper folding (1905)
Sundara Rao, T. (Tandalam), b. 1853, Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Chicago : Open Court · leaf 126
ir extrem- ities towards the same parts form a trapezoid which has an axis of symmetry, viz., the diameter perpen- dicular to the parallel chords. The diagonals of the trapezoid intersect on the diameter. It is evident by folding that the angles between each of the parallel chords and each diagonal… … An inscribed angle equals half the central angle standing on the same arc. Given AVB an inscribed angle, and A OB the central angle on the same arc AB. To prove that / A VB = \L A OB. Proof. 1. Suppose VO drawn through center O, and pro- duced to meet the circumference at X.
Geometry · Paper work
Internet Archive · Wellesley College Library · Public domain (published before 1931). Free to use for anything.
