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

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A line of fixed length \( (a+b) \) moves so that its ends are always on two fixed perpendicular straight lines.
\( \mathrm{P} \) The locus of the point which divided this line into portions of lengths \( a \& b \), is:

W
(A) an ellipse
(B) an hyperbola
(C) a circle
(D) a straight line
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