Published online by Cambridge University Press: 03 November 2016
This is a continuation of a note in the Gazette of May, 1954.
page 109 note * Given as an exercise in E. W Hobson : Plane Trigonometry (Camb. Univ. Press, 3rd edition, 1911) p. 201, § 159, No. 3.
page 110 note † Discovered by Pappus : see W W Rouse Ball, A Short History of Mathematics (Macmillan, 6th edition., 1915) p. 100.
page 111 note * Adapted and extended from N. Alliston, Mathematical Snack Bar, (Heffers, Cambridge, 1936) Ch. 1, pp 12-13.