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.

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.

The diameter of a circle is a line that passes through the center and meets the circumference at opposite ends. It is twice as long as the radius of the circle.

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.

The standard diameter symbol consists of a perfect circle with a 45° line that extends outside the circle. This is the officially recognized symbol for indicating diameter measurements in technical and …

If you're wondering how to calculate the diameter of a circle, this diameter of a circle calculator is a perfect choice. You will need either the radius, the circumference, or the area of a given circle for the …

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 …

Aug 3, 2023 · The diameter of a circle is the line segment that passes through the center of the circle and has its two endpoints on the circle. It is the longest distance from one end of the circle to the …

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

Learn about diameter in Maths—definition, formulas, and solved examples. Quickly find diameter from radius, area, or circumference for exams and real-life use.