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A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. The distance between any point of the circle and the centre is called the radius. The circle has been known since before the beginning of recorded history. Natural circles are common, such as the full moon or a slice of round fruit.
- Circle basics. Circles glossary. Radius, diameter, circumference & π. (Opens a modal) Proof: all circles are similar.
- Arc measure. Intro to arc measure. Finding arc measures. (Opens a modal) Finding arc measures with equations. Practice.
- Arc length (from degrees) Arc length from subtended angle. Subtended angle from arc length. (Opens a modal) Challenge problems: Arc length 1.
- Introduction to radians. Intro to radians. Radians & degrees. (Opens a modal) Degrees to radians. Radians to degrees.
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.
Learn the relationship between the radius, diameter, and circumference of a circle.
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.
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Definition. Circle: the set of all points on a plane that are a fixed distance from a center. Area. The area of a circle is π times the radius squared, which is written: A = π r 2. Where. A is the Area. r is the radius. To help you remember think "Pie Are Squared" (even though pies are usually round):