After studying this chapter, the student will be able to understand:

The standard equation of a circle

General equation and parametric equation of a circle

The centre and radius of the general equation of a circle

The equation of a circle touching the axes

The equation of a circle where the extremities of a diameter are given

The intersection of lines

*ac*+*by*+*c*= 0 (*a*^{2}+*b*^{2}≠ 0) with the circle*x*^{2}+*y*^{2}=*r*^{2}The position of a point with respect to the circle

The equation of a tangent to the circle at a given point

The condition in the tangent of lines to the circle and co-ordinates of contact

The length of the tangent drawn to the circle from the point outside the circle

Relation between two circles

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