circle

Related Questions

• Locus of the points from which perpendicular tangent can be drawn to the circle ${{x}^{2}}+{{y}^{2}}={{a}^{2}}$ , is

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• The equation of circle whose diameter is the line joining the points (–4, 3) and (12, –1) is

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• P, Q and R are the centres and ${{r}_{1}},\,\,{{r}_{2}},\,\,{{r}_{3}}$ are the radii respectively of three co-axial circles, then $QRr_{1}^{2}+RP\,r_{2}^{2}+PQr_{3}^{2}$ is equal to

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• The line $x\cos \alpha +y\sin \alpha =p$ will be a tangent to the circle ${{x}^{2}}+{{y}^{2}}-2ax\cos \alpha -2ay\sin \alpha =0$ , if $p=$

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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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