The French fashion house is resurrecting four rare furniture designs by Charlotte Perriand for an exhibition titled "Saint ...

The design — five rings and a center with the Olympic logo — was inspired by Chinese jade concentric circle pendants. Jade is considered one of the most precious stones in China, dating back to ...

If you know the diameter of this circle is 18cm, can you work out the radius? Concentric circles are circles with the same centre point, but the length of their radius is different. If you throw a ...