In mid-March, the mathematicians Joshua Greene and Andrew Lobb found themselves in the same situation: locked down and struggling to adjust while the COVID-19 pandemic grew outside their doors. They ...

Well, what is the best way to cut a sandwich in half? Surely triangles don't really have "more sandwich," right? That's geometry and the law of conservation of matter. But something about the ...

An important lesson in every geometry class is learning the differences between rectangles and squares. So, as we start a brand new school year, let’s keep this challenge incredibly simple: In the ...

Label the rectangles correctly with the letters A to I. Show puzzle solution Only the four blue-shaded rectangles below intersect three other rectangles, and therefore they must be F, G, H and I. H ...

Today’s two questions test your geometrical smarts. The first is about a triangle, the second about a square. 1. Tricky triangle This one was sent in by a reader, aged 85, who first saw it in 1960. He ...

Earlier today I set you the following two problems. Here they are again with solutions. 1. Tricky triangle What is the length of AD, the dashed line? Solution: x = 1 The reason that most people fail ...