circle

Related Questions

• Line $y=x+a\sqrt{2}$ is a tangent to the circle ${{x}^{2}}+{{y}^{2}}={{a}^{2}}$ at

  ---

• The number of common tangents to two circles ${{x}^{2}}+{{y}^{2}}=4$ and ${{x}^{2}}-{{y}^{2}}-8x+12=0$ is

  ---

• If the line $lx+my+n=0$ be a tangent to the circle ${{(x-h)}^{2}}+{{(y-k)}^{2}}={{a}^{2}},$ then

  ---

• In the co-axial system of circle ${{x}^{2}}+{{y}^{2}}+2gx+c=0$ , where g is a parameter, if $c>0$ then the circles are

  ---

• If the lengths of the chords intercepted by the circle ${{x}^{2}}+{{y}^{2}}+2gx+2fy=0$ from the co-ordinate axes be 10 and 24 respectively, then the radius of the circle is

  ---