If in general quadratic equation \[f(x,\,y)=0\], \[\Delta =0\] and \[{{h}^{2}}=ab\], then the equation represents

Two perpendicular straight lines

If in general quadratic equation \[f(x,\,y)=0\], \[\Delta =0\] and \[{

1.	If in general quadratic equation \[f(x,\,y)=0\], \[\Delta =0\] and \[{{h}^{2}}=ab\], then the equation represents
A.	Two parallel straight lines
B.	Two perpendicular straight lines
C.	Two coincident lines
D.	None of these
Answer» B. Two perpendicular straight lines

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If in general quadratic equation \[f(x,\,y)=0\], \[\Delta =0\] and \[{{h}^{2}}=ab\], then the equation represents

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