pair-st-lines

Question: The lines joining the points of intersection of the curve ${{(x-h)}^{2}}+{{(y-k)}^{2}}-{{c}^{2}}=0$ and the line $kx+hy=2hk$ to the origin are perpendicular, then



1) $c=h\pm k$
2) ${{c}^{2}}={{h}^{2}}+{{k}^{2}}$
3) ${{c}^{2}}={{(h+k)}^{2}}$
4) $4{{c}^{2}}={{h}^{2}}+{{k}^{2}}$
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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