It's one of those things most people remember from their school days. The angles in a triangle always add up to 180˚. And a right-angled triangle always has one angle that is 90°, so the other two ...

If you enjoy spending time solving puzzles, here we have a brain teaser that can leave you perplexed. This question will require you to use your maths skills. Brain teasers are mind-bending challenges ...