Circles Test 1...

Let $$C$$ be the circle with centre at $$(1,\ 1)$$ and radius $$=1$$. If $$T$$ is the circle centered at $$ (0,\ y)$$, passing through origin and touching the circle $$C$$ externally, then the radius of $$T$$ is equal to :

If the lines $$2\mathrm{x}+3\mathrm{y}+1=0$$ and $$\mathrm{3x}- \mathrm{y}-4=0$$ lie along diameters of a circle of circumference $$ 10\pi$$, then the equation of the circle is: 

The equation of the circle touching $$x = 0, y = 0$$ and $$x = 4$$ is

The radius of the circle with center (0,0) and which passes through (-6,8) is

The equation of circle with its centre at the origin is $$x^2+y^2=r^2$$

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