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→Geometry in Three Dimensions
=Geometry in Three Dimensions=
=Geometry in Three Dimensions=
[[Image:Xyz_right.jpg|200px|right|thumb|The right-handed xyz coordinate system.]]
In three dimensions, we most often work with the xyz coordinate system. This system is called "right handed," because if we take our right palm, with our knuckles pointing in the positive x direction, and bend our fingers so that they point in the positive y direction, our thumbs automatically point in the positive z direction. See illustration.
In three dimensions, we most often work with the xyz coordinate system. This system is called "right handed," because if we take our right palm, with our knuckles pointing in the positive x direction, and bend our fingers so that they point in the positive y direction, our thumbs automatically point in the positive z direction. See illustration.