1. Unit circleIn mathematics, a unit circle is a circle with a radius of one. Frequently, especially in trigonometry, the unit circle is the circle of radius one centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane. The unit circle is often denoted S; the generalization to higher dimensions is the unit sphere. If (x, y) is a point on the unit circle in the first quadrant, then x and y are the lengths of the legs of a right triangle whose hypotenuse has length 1.
Read “Unit circle” on English Wikipedia
Read “単位円” on Japanese Wikipedia
Read “Unit circle” on DBpedia
Read “Unit circle” on English Wikipedia
Read “単位円” on Japanese Wikipedia
Read “Unit circle” on DBpedia
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