The circle is a location of a point that progresses at a regular distance from a fixed point. These fixed points are called the centre of the circle and this regular distance is called a Radius. If we consider r as the radius of the circle the diameter becomes d=2r.
Diameter is the maximal distance between any of the two points given in a particular circle.
Hence we can split up the diameter into two parts first from any endpoint of a circle to the centre and second from the centre to another endpoint on the circle.
The word circle is the origin from Greek which means kirkos, hoop, or ring.
x²+y²+2gx+2fy+c=0 is the general equation of a circle, in which g, f, c, are constants.
The middle point of the circle is (-g, -f) that is -½ coefficient of x and -½ coefficient of y.
If the radius of the circle is equal to r then r=
If the radius r of the given circle x²+y²+2gx+2fy+c=0 touches the x and y-axis then g²=c and f²=c respectively.
Angle delimited at a centre of a circle by an arc given by arc/radius.