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  1. Circle - Wikipedia

    Natural circles are common, such as the full moon or a slice of round fruit. The circle is the basis for the wheel, which, with related inventions such as gears, makes much of modern machinery …

  2. CIRCLE Definition & Meaning - Merriam-Webster

    The meaning of CIRCLE is ring, halo. How to use circle in a sentence.

  3. Circle Calculator

    Aug 1, 2025 · Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns.

  4. Circle - Math is Fun

    There are two main slices of a circle. The Quadrant is a special sector with a right angle. It has a quarter of the circle's area. Half a circle is called a Semicircle. A circle has an inside and an …

  5. What is a Circle? Definition, Formulas, Properties, Examples

    A circle is a two-dimensional closed figure that has no edges or corners. Learn the definition of circle, different parts of circle, solved examples and more.

  6. Circle Launches Arc Public Testnet

    2 days ago · A New Economic Operating System for the Internet Opens with Over 100 Launch and Design Participants NEW YORK — October 28, 2025 — Circle Internet Group, Inc. …

  7. circle

    1. a continuous curved line, the points of which are always the same distance…