Mathematical wrinkles for teachers and private learners .. (1912)
Jones, Samuel I. (Samuel Isaac), b. 1880 · Gunter, Tex., S.I. Jones · leaf 211
MATHEMATICAL WRINKLES 200 53. 33^ feet. 54. 71.344 feet from smaller; 70,071 feet from larger. 63. 4.192 feet from large end. 55. 15.38766 feet. 65. 154.9866. 56. 2 feet. 67. 2106 square yards. 57. 1.84 cubic feet. 68. 80=base; 60 = altitude. 58. 126 j^ square inches. 69. 101 feet. 59. 122.84… … 81. Let PA' and B'C intersect at K. Draw through K a line parallel to BO cutting AB at x and AC at y. A PB'C is isosceles; therefore Z.B' = /. C. The points P, K, y, B' are concyclic; hence Z y = Z B'. The points P, x, O, K are con- cyclic ; hence Ax = ZC'. .-. Z.x = Ay, and A Pxy is isosceles.…
Mathematics · Mathematical recreations
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