Quotable maths: Roberts Sep 6, 2012 A selection of other posts Oct 27, 2021 Ask Uncle Colin: Why is this pi by 4? Jun 12, 2018 Wrong, But Useful: Episode 57 Jan 12, 2015 Wrong, But Useful - Episode 22 Dec 24, 2012 Recurring Decimals - Secrets of the Mathematical Ninja subscribe via RSS