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  1. Diameter - Wikipedia

    In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle.

  2. Diameter of a Circle - Definition, Examples | Diameter Formula

    Diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circumference of a circle. Learn how to find the diameter of a circle using radius, …

  3. What Is a Diameter & How to Measure It? A Beginner’s Guide

    Oct 22, 2025 · From clear definitions and real-life examples to FAQs and a quick quiz, explore everything you need to know about diameter in this guide.

  4. How to Calculate Diameter of a Circle - GeeksforGeeks

    Jul 23, 2025 · To calculate the diameter of a circle we use the formula D = 2r. The diameter of any circle is the longest chord of the circle, that passes through the centre of the circle.

  5. Diameter of a circle definition and calculator- Math Open Reference

    The diameter of a circle is the length of the line through the center and touching two points on its edge. In the figure above, drag the orange dots around and see that the diameter never changes.

  6. Radius, diameter, & circumference - Khan Academy

    Learn the relationship between the radius, diameter, and circumference of a circle.

  7. Diameter - Math.net

    The diameter of a circle is a line segment that passes through the center of the circle and has endpoints on the circle. Line segment AB above is a diameter for circle O since endpoints A and B lie on the …

  8. 3 Ways to Calculate the Diameter of a Circle - wikiHow

    Apr 15, 2025 · The diameter of a circle is the distance straight across the circle from one side to the other at its center. Depending on what other information you have about the circle, there are a few …

  9. DIAMETER Definition & Meaning - Merriam-Webster

    The meaning of DIAMETER is a chord passing through the center of a figure or body. How to use diameter in a sentence.

  10. Diameter of a Circle : Definition, Formulas with solved examples

    Feb 9, 2025 · The diameter is a crucial measurement for determining the size and scale of a circle. It provides information about the extent of the circle and helps establish its dimensions.