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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 …

  2. Radius, diameter, & circumference | Circles (article) | Khan Academy

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

  3. 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 …

  4. 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.

  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. 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.

  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 …

  8. Diameter Definition (Illustrated Mathematics Dictionary)

    Illustrated definition of Diameter: The distance from one point on a circle through the center to another point on the circle. It is also the...

  9. Circle Calculator

    This calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement.

  10. Diameter Definition & Meaning | Britannica Dictionary

    DIAMETER meaning: 1 : a straight line from one side of something (such as a circle) to the other side that passes through the center point; 2 : the distance through the center of something …