File:Circle-withsegments.svg · Wikimedia Commons · See Wikimedia Commons
A diameter is a straight line that passes through the center of a circle and connects two points on the circle's edge. It's useful because it's the longest distance across a circle and helps define the circle's size—the diameter is exactly twice the radius (the distance from the center to the edge).
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- Symbol.sign
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- Diameter-2-ubt.svg
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- Unicode character
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- Diameter
- recommended unit of measurement
- metre
- maintained by WikiProject
- WikiProject Mathematics
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Article · Deutsch
Der Durchmesser (griechisch διάμετρος diámetros) eines Kreises oder einer Kugel ist der größtmögliche Abstand zweier Punkte der Kreislinie oder der Kugeloberflächenpunkte. Beim Kreis ist dies die längstmögliche Sehne. Der Durchmesser eines Rotationskörpers ist die längste Sehne senkrecht zur Rotationsachse des Körpers.
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