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(C) Let the two fixed straight lines be the coordinate axes $x$ and $y$. Let the bar have length $L = a + b$,where $a$ and $b$ are the segments of the

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Ellipse

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(C) Let the two fixed straight lines be the coordinate axes $x$ and $y$. Let the bar have length $L = a + b$,where $a$ and $b$ are the segments of the bar divided by the point $P(h, k)$.When the bar makes an angle $	heta$ with the $x$-axis,the coordinates of point $P$ are given by $h = a \cos 	heta$ and $k = b \sin 	heta$.From these,we have $\cos 	heta = \frac{h}{a}$ and $\sin 	heta = \frac{k}{b}$.Using the identity $\cos^2 	heta + \sin^2 	heta = 1$,we get:$\frac{h^2}{a^2} + \frac{k^2}{b^2} = 1$.This is the equation of an ellipse.

If a bar of given length moves with its extremities on two fixed straight lines at right angles,then the locus of any point marked on the bar describes a/an

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