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diameter
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diameter

mathematics
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The term "diameter" has multiple meanings, primarily in mathematics and physics. In mathematics, a diameter is a straight line segment that passes through the center of a circle or other figure, connecting two points on its boundary. It is also used to refer to the length of this line segment. For a circle, the diameter is twice the length of its radius. In physics, "diameter" can indicate magnification by a lens or optical system, specifying how much an object is enlarged. The abbreviation "diam" is also used for diameter.123

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