A line of fixed length \( a+b \) moves so that its ends \( \mathrm{...

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A line of fixed length \( a+b \) moves so that its ends
\( \mathrm{P}^{1450} \) are always on two fixed perpendicular straight lines,

W. then the locus of a point, which divides this line into portions of lengths \( a \) and \( b \) is a/an:
(1) Ellipse
(2) Parabola
(3) Straight line
(4) None of these
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