FP1 Complex Numbers quiz May 21, 2013 [mtouchquiz 10] A selection of other posts Sep 2, 2015 Ask Uncle Colin: A nasty triangle Aug 10, 2015 How the Mathematical Pirate finds the centre and radius of a circle Oct 6, 2014 An awkward inequality Sep 10, 2012 Secrets of the Mathematical Ninja - nth roots (in your head) subscribe via RSS