with concentric circles, squares, and symbols that suggest a profound knowledge of the universe. In a report from 1911 HCP Bell said: "This ancient 'map of the world', perhaps the oldest that ...

In each three- to six-foot-wide arrangement, stones were placed in concentric circles surrounding a large central stone. Under some of the stone circles, excavators uncovered pottery sherds and ...

Rujm el-Hiri, an ancient basalt rock structure ... of 42,000 basalt rocks up to 2.5 metres high, arranged in concentric circles along with smaller structures sharing similar design principles.

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 ...