The unit circle has an area of exactly pi............a half unit circle......one whose radius is 1/2.....or 0.5.....would have a circumference of pi........the R. hyp......is why the zeros....line up at 1/2.......
In 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.
https://en.wikipedia.org/wiki/Unit_circle
https://en.wikipedia.org/wiki/Unit_circle
In 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.
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