+The **radius** is a line segment, or its length, extending from the center of a [Circle](/wiki/circle) to any point on its boundary. It gracefully defines the size of a shape, marking its reach from the core to its [Edge](/wiki/edge).
+## See also
+- [Diameter](/wiki/diameter)
+- [Circumference](/wiki/circumference)
+- [Sphere](/wiki/sphere)
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