circle

Related Questions

• The equation of the circle which intersects circles ${{x}^{2}}+{{y}^{2}}+x+2y+3=0$ ,${{x}^{2}}+{{y}^{2}}+2x+4y+5=0$ and ${{x}^{2}}+{{y}^{2}}-7x-8y-9=0$ at right angle, will be

  ---

• The equation of the circle with centre on the x-axis, radius 4 and passing through the origin, is

  ---

• The equation of the tangent to the circle ${{x}^{2}}+{{y}^{2}}={{r}^{2}}$ at $(a,b)$ is $ax+by-\lambda =0$ , where $\lambda $ is

  ---

• A circle which passes through origin and cuts intercepts on axes a and b, the equation of circle is

  ---

• $a{{x}^{2}}+2{{y}^{2}}+2bxy+2x-y+c=0$ represents a circle through the origin, if

  ---