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History
Concentric objects
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In geometry, two or more objects are said to be concentric when they share the same center. Any pair of objects with well-defined centers can be concentric, including circles, spheres, regular polygons, regular polyhedra, parallelograms, cones, conic sections, and quadrics.
Ripples in water
Ripples in water
Histology of a Pacinian corpuscle, in a typical expanding circular pattern.
Histology of a Pacinian corpuscle, in a typical expanding circular pattern.
Tree rings, as can be used for tree-ring dating
Tree rings, as can be used for tree-ring dating
Circle
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A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. The distance between any point of the circle and the centre is called the radius.
Circular cave paintings in Santa Barbara County, California
Circular cave paintings in Santa Barbara County, California
Circles in an old Arabic astronomical drawing.
Circles in an old Arabic astronomical drawing.
The compass in this 13th-century manuscript is a symbol of God's act of Creation. Notice also the circular shape of the halo.
The compass in this 13th-century manuscript is a symbol of God's act of Creation. Notice also the circular shape of the halo.