Article is a piece of crap. Normally I can at least sympathise with the 'Comment is Free' articles in the good ol' Grauniad, but this just highlights someone who really doesn't understand how maths works, or how a lot of it is applicable in every day situations. Sure, you will most likely never use circle theorems after finishing your GCSEs, but I use a lot of the way of thinking taught to me by studying maths in everyday situations. Without at least some knowledge of how probability works, for instance, one will be repeatedly fooled by many common fallacies (especially e.g. survivorship bias). My guess is this guy thinks he hasn't benefited hugely from learning maths just because he doesn't use trigonometry in his day-to-day life without thinking more about it.