pair-st-lines

Question: The distance between the pair of parallel lines ${{x}^{2}}+2xy+{{y}^{2}}-8ax-8ay-9{{a}^{2}}=0$ is



1) $2\sqrt{5}a$
2) $\sqrt{10}\,a$
3) $10\,a$
4) $5\sqrt{2}\,a$
Solution: Explanation: No Explanation
Equation of lines joining the origin to the point of intersection of a curve and a line and Distance between the pair of lines

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