A free online circle calculator is used to calculate the radius, circumference, area and diameter of a circle along with the formula of the circle.
What is Circle
A circle is a closed plane curve that divides the plane into two regions, an interior and an exterior, such that every point on the curve is at a fixed distance from a fixed point. The fixed point is called the centre and the distance is called the radius.
Circle formula
Where r = radius of circle
- Area of circle = πr²
- Circumference of circle = 2πr
- diameter of circle = 2r
Solved Example
Example.:-Circle of Radius = 10 cm, find the area of a circle, the circumference of the circle and the diameter of the circle Area of the circle = πr² = 314.15927 cm²
Area of circle = πr² = 314.15927 cm²
Circumference of circle = 2πr = 62.83185 cm
Diameter of circle = 2r = 20 cm