Regular polygons and circles

There are 118 NRICH Mathematical resources connected to Regular polygons and circles
Gibraltar Geometry
problem

Gibraltar geometry

Age
11 to 14
Challenge level
filled star empty star empty star
Take a look at the photos of tiles at a school in Gibraltar. What questions can you ask about them?
Using GeoGebra
article

Using geogebra

Never used GeoGebra before? This article for complete beginners will help you to get started with this free dynamic geometry software.
Placeholder: several colourful numbers
project

Flip your mat!

What shape and size of drinks mat is best for flipping and catching?

Incircles Explained
article

Incircles explained

This article is about triangles in which the lengths of the sides and the radii of the inscribed circles are all whole numbers.
Arclets Explained
article

Arclets explained

This article gives an wonderful insight into students working on the Arclets problem that first appeared in the Sept 2002 edition of the NRICH website.
Pi, a Very Special Number
article

Pi, a very special number

Read all about the number pi and the mathematicians who have tried to find out its value as accurately as possible.
Circles, circles everywhere
article

Circles, circles everywhere

This article for pupils gives some examples of how circles have featured in people's lives for centuries.