circle

Related Questions

• The line $3x-2y=k$ meets the circle ${{x}^{2}}+{{y}^{2}}=4{{r}^{2}}$ at only one point, if ${{k}^{2}}$ =

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• The radical centre of three circles described on the three sides of a triangle as diameter is

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• The equation of radical axis of the circles ${{x}^{2}}+{{y}^{2}}+x-y+2=0$ and $3{{x}^{2}}+3{{y}^{2}}-4x-12=0,$ is

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• Centre of the circle ${{(x-3)}^{2}}+{{(y-4)}^{2}}=5$ is

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• If the circles ${{x}^{2}}+{{y}^{2}}=4,{{x}^{2}}+{{y}^{2}}-10x+\lambda =0$ touch externally, then $\lambda $ is equal to

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