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OpenStudy (anonymous):
Two planets X and Y travel counterclockwise in circular orbits about a star, as seen in the figure. The radii of their orbits are in the ratio 5:3. At some time, they are aligned, as seen in (a), making a straight line with the star. Five years later, planet X has rotated through 86.8°, as seen in (b). By what angle has planet Y rotated through during this time?
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