W hen most people think of shapes, they imagine a triangle, a rectangle, or maybe even a fancier- sounding rhombus or ...

Can you see any shapes with curved lines? Why not try drawing a picture using only straight lines. A triangle has 3 sides and 3 vertices (corners). A vertex is where two lines meet or join.

Simply sign up to the War in Ukraine myFT Digest -- delivered directly to your inbox. French President Emmanuel Macron has said a so-called reassurance force of European troops in post-conflict ...

Crows are able to look at a handful of four-sided shapes and correctly distinguish those that exhibit ... that crows clearly ...