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 possible.

A circle is a 2-dimensional closed shape that has a curved side whose ends meet to form a round shape. Learn about circles with concepts, properties, and examples.

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.

Circles make the world go ’round. Learn about the all-important shape, the circle, in our handy guide.

Test your understanding of Circles with these 12 questions. Explore, prove, and apply important properties of circles that have to do with things like arc length, radians, inscribed angles, and tangents.

Circle worksheets, videos, tutorials and formulas involving arcs, chords, area, angles, secants and more.

2 days ago · In case of a circle, it is much easier since we only need its radius or diameter to describe its geometry. Circle. Then, what are the radius and diameter of a circle? Their concepts are very …

Dec 1, 2025 · What is a Circle? A circle is a simple closed curve, with a set of all points at a constant distance from a fixed (center) point, A, in the same plane. Since the circle has only one center, you …

In Maths or Geometry, a circle is a special kind of ellipse in which the eccentricity is zero and the two foci are coincident. A circle is also termed as the locus of the points drawn at an equidistant from the …

Learn about circles with easy explanations, visual examples, and interactive quizzes. Perfect for K-5 students learning geometry concepts.