Define point circle. - Vidyadip

Question

Define point circle.

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Answer

When the value of radius of a circle is zero, then equation of circle
$\quad$$\quad$$(x-h)^2+(y-k)^2=0$
In this way the circle becomes smaller and only one point remains, then it is called a point circle. $x^2+y^2$ $=0$ is a point circle at origin $(0,0)$.

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