circle

Question: The line $y=x+c$ will intersect the circle ${{x}^{2}}+{{y}^{2}}=1$ in two coincident points, if



1) $c=\sqrt{2}$
2) $c=-\sqrt{2}$
3) $c=\pm \sqrt{2}$
4) None of these
Solution: Explanation: No Explanation
Tangent and normal to a circle

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