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

\[{{c}^{2}}={{h}^{2}}+{{k}^{2}}\]

\[4{{c}^{2}}={{h}^{2}}+{{k}^{2}}\]

The lines joining the points of intersection of the curve \[{{(x-h)}^{

1.	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
A.	\[c=h\pm k\]
B.	\[{{c}^{2}}={{h}^{2}}+{{k}^{2}}\]
C.	\[{{c}^{2}}={{(h+k)}^{2}}\]
D.	\[4{{c}^{2}}={{h}^{2}}+{{k}^{2}}\]
Answer» C. \[{{c}^{2}}={{(h+k)}^{2}}\]

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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

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