scrutinizer

Ooooops I must be confusing with this  $$\lim\limits_{x \to 0}{\frac{c}{x}} = \infty$$    $$c = const$$ . Really sorry, I'm just hooked on maths analysis recently.

You should rely on the formula of a circle that looks as  $$(x - x_{center})^2 + (y - y_{center})^2 = R^2$$ ,

where the center of a circle has coordinates  $$(x_{center}; y_{center})$$ , any point of the coordinate system has coordinate  $$(x ; y)$$ ,  $$R$$  is radius. Good luck!

Please, put your question in a more appriate and mathematically correct shape. Your question is too general.

-9/0 = -infinity