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 ...

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 ...

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 ...

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 ...