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The diameter of a geometric figure is the greatest length that can be formed between two opposite parallel straight lines that can be drawn tangent to its boundary.
- Definition:Diameter of Circle, whose definition is consistent with this.
- Definition:Diameter of Parallelogram, whose definition is not consistent with this.
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): diameter: 2.