circle

Related Questions

• If O is the origin and OP, OQ are tangents to the circle ${{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0$ , the circumcentre of the triangle $OPQ$ is

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• The equation of the chord of the circle ${{x}^{2}}+{{y}^{2}}={{a}^{2}}$ having $({{x}_{1}},{{y}_{1}})$ as its mid-point is

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• The number of tangents which can be drawn from the point (–1,2) to the circle ${{x}^{2}}+{{y}^{2}}+2x-4y+4=0$ is

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• The gradient of the tangent line at the point $(a\cos \alpha ,a\sin \alpha )$ to the circle ${{x}^{2}}+{{y}^{2}}={{a}^{2}}$ , is

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• The equation of the circle concentric with the circle ${{x}^{2}}+{{y}^{2}}-4x-6y-3=0$ and touching y-axis, is

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