Circles Test 4...

Which is not represented by quadratic equation ?

Find the area of $$x^2+y^2=49$$

The equation $${ x }^{ 2 }+{ y }^{ 2 }=9$$ meets x-axis at 

Find the Center of circle $$x^2+y^2-4x-8x+25=0$$

Radius of the circle $$2x^2+2y^2+8x+4y-3=0$$ is

The equation of the circle passing through $$(2,0)$$ and $$(0,4)$$ and having the minimum radius is ______________.

The locus of a point which moves such that the sum of the squares of its distances from three vertices of a triangle ABC is constant is a circle
whose centre is at the

The lines 2x-3y $$=5$$ and 3x-4y $$=7$$ diameters of a circle having area as $$154$$ units. Then the equation of the circle is:

lf the line $$3{x}-2{y}+6=0$$ meets $${x}$$-axis, $$y$$-axis respectively at $${A}$$ and $${B}$$, then the equation of the circle with radius $${A}{B}$$ and Centre at $${A}$$ is

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