| 41. | A point in the complex plane can be represented by a complex number written in polar coordinates.
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| 42. | Sensors operate using a polar coordinate system.
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| 43. | The radar uses a polar coordinate system.
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| 44. | A handful of machines use polar coordinates instead, usually machines optimised to print objects with circular symmetry.
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| 45. | This is the equation in polar coordinates for a conic section with origin in a focal point.
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| 46. | There are various accounts of the introduction of polar coordinates as part of a formal coordinate system.
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| 47. | In cylindrical coordinates on the sphere and polar coordinates on the plane, the projection and its inverse are
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| 48. | The integrals over the two disks can easily be computed by switching from cartesian coordinates to polar coordinates:
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| 49. | In 1893 Durand published a paper mathematically describing a radial planimeter for averaging values plotted in polar coordinates.
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| 50. | For example, in polar coordinates:
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