Parts of a circle. Part of Maths 2D shapes Year 6. ... Concentric circles are circles with the same centre point, but the length of their radius is different. If you throw a pebble in a pond, ...

The radius of the first circle is shown as 3cm. They then increase by 2cm each time: 5cm → 7cm → 9cm → 11cm. So, the radius of the largest circle is 11cm.