# The equation of the circle online calculator

Online calculator which helps you in solving the equations of the circle.
First of all you need to know the definition of a circle a circle is the set of points in space equidistant from a single point, called the center.
The segment connecting two points of the circle and passing through the centre is called a diameter.
The segment connecting two points of a circle – chord.
The line segment joining center and any point on the circumference – the radius.
The radius is half the diameter.
Calculating the equation of the circle we obtain the following information: (coordinates of the center point, the length of the radius).
Knowing the length of the radius and the coordinates of the center point, you can determine the coordinates of any point and draw a circle.
A circle is the set of points on the plane coordinates, located inside the circle.

Specify the coordinates of the three points:
Point A (X,Y)

Point B (X,Y)

Point C (X,Y)

Center Point: