If you’ve ever flown across the world, you’ll know one thing for sure: it’s a very, very long way. It’s not the biggest planet in our solar system by a long way, but in terms of the perspective of a ...

In our mind’s eye, the universe seems to go on forever. But using geometry we can explore a variety of three-dimensional shapes that offer alternatives to “ordinary” infinite space. When you gaze out ...

The perimeter of a circle is called the circumference. The shortest distance from the centre to the circumference is called the radius. The line across the centre of a circle is the diameter, this is ...