Zach’s design for a pond in the virtual city park leads to Ada explaining the properties of regular and irregular polygons. Suitable for teaching maths at KS2 in England, Wales and Northern ...

A polygon is a closed 2D shape with at least three sides. A regular polygon is a polygon with all equal sides and angles. An irregular polygon is a polygon where this is not the case.

We were interested to read Alex Chablo's query (Letters, AJ 3/10.8.00), where he asks about fitting interlocking hexagons onto a spherical surface. This apparent contradict ion comes from the meaning ...

But that’s it for the regular polygons. Now it gets complicated. Even with irregular shapes included, it can be mathematically proven, for example, ...