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[QUOTE="Orodruin, post: 4866087, member: 510075"] Assuming that (3) is a straight line, you can parametrize it using the angle ##\theta## as the curve parameter. You can then use the relation ##dr = \frac{dr}{d\theta} d\theta## (essentially the chain rule) to rewrite the differential. Note that what you want for ##r(\theta)## is a linear function such that ##r(\pi/2) = 1## and ##r(\arctan(1/2)) = \sqrt 5##. [/QUOTE]
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