| 31. | The hypot function is often used together with the atan2 function to convert from polar coordinates:
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| 32. | They are central to polar coordinates and trigonometry.
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| 33. | That is convert polar coordinates to Cartesian coordinates.
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| 34. | Usually this is done in spherical polar coordinates:
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| 35. | The radar uses a polar coordinate system.
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| 36. | A handful of machines use polar coordinates instead, usually machines optimised to print objects with circular symmetry.
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| 37. | There are various accounts of the introduction of polar coordinates as part of a formal coordinate system.
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| 38. | This is the equation in polar coordinates for a conic section with origin in a focal point.
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| 39. | Fig . 5 shows luminance and contrast versus " viewing direction " in a polar coordinate system.
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| 40. | Convert that point back to polar coordinates.
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