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In this article, we are going to understand the concept of the diameter of a circle, what is diameter , the diameter symbol, and also the formula for the diameter of the circle. From clear definitions and real-life examples to FAQs and a quick quiz, explore everything you need to know about diameter in this guide. 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, circumference, and area. In more modern usage, the length of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter (which refers to the line segment itself), because all diameters of a circle or sphere have the same length, this being twice the radius.
