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Gardeners use them to separate areas of flowers; cabinetmakers use them for table tops. Elliptical bicycle gears make it easier for the chain to slip off of the cog when changing gears. A 'great ellipse' may be proposed as a suitable route in marine navigation. The fields of optics, computer graphics, statistics and finance, and planetary science all have their uses for ellipses. Even the architectural design of the National Statuary Hall at the United States Capitol and St. Paul's Cathedral in London are said to bear the properties of a whispering room, or whispering gallery- that is, persons standing at or near one focal point can hear quite well what others are saying to each other when they are standing at the other focal point.

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Q: What is reason for using ellipse?
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