Conic Sections ...

Which of the following equations of a circle has center at (1, -3) and radius of 5?

Determine the area enclosed by the curve $$\displaystyle x^{2}-10x+4y+y^{2}=196$$

The standard equation of circle at origin is

The diameter of a circle described by $$\displaystyle 9x^{2}+9y^{2}=16$$ is

A circle has a diameter whose ends are at (-3, 2) and (12, -6) Its Equation is

Find the equation of a circle with center $$(0, 0)$$ and radius $$5$$.

What is the radius of the circle with the following equation?
$$\displaystyle x^{2}-6x+y^{2}-4y-12=0$$

The locus of a planet orbiting around the sun is: 

Number of intersecting points of the conic $$4x^{2} + 9y^{2} = 1$$ and $$4x^{2} + y^{2} = 4$$ is

What is the nature of the given graph?