+The **Diameter** is a straight line segment that passes through the [Center](/wiki/Center) of a [Circle](/wiki/Circle) or [Sphere](/wiki/Sphere), connecting two points on its boundary. It represents the greatest distance across such a shape, and its length is twice the [Radius](/wiki/Radius).
+## See also
+- [Circumference](/wiki/Circumference)
+- [Radius](/wiki/Radius)
+- [Geometry](/wiki/Geometry)
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