circle

Question: An infinite number of tangents can be drawn from (1, 2) to the circle ${{x}^{2}}+{{y}^{2}}-2x-4y+\lambda =0$ , then $\lambda =$



1) – 20
2) 0
3) 5
4) Cannot be determined
Solution: Explanation: No Explanation
Tangent and normal to a circle

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