Questions in circle

Select	Question
	The equation of the circle which passes through the points (2, 3) and (4, 5) and the centre lies on the straight line $y-4x+3=0$ , is
	The equation of the circle with centre at (1, –2) and passing through the centre of the given circle ${{x}^{2}}+{{y}^{2}}+2y-3=0$ , is
	The equation of the circle concentric with the circle ${{x}^{2}}+{{y}^{2}}+8x+10y-7=0$ and passing through the centre of the circle ${{x}^{2}}+{{y}^{2}}-4x-6y=0$ is
	The equation of the circle passing through the points (0, 0), (0, b) and (a, b) is
	The equation $a{{x}^{2}}+b{{y}^{2}}+2hxy+2gx+2fy+c=0$ will represent a circle, if
	The equations of the circles touching both the axes and passing through the point (1, 2) are
	Which of the following line is a diameter of the circle ${{x}^{2}}+{{y}^{2}}-6x-8y-9=0$
	A circle is concentric with the circle ${{x}^{2}}+{{y}^{2}}-6x+12y+15=0$ and has area double of its area. The equation of the circle is
	If the radius of the circle ${{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0$ be r, then it will touch both the axes, if
	The equation of the circle with centre on the x-axis, radius 4 and passing through the origin, is