or angle in radians (theta) is arc length (s) divided by radius (r). A circle has 360 degrees or 2pi radians — going all the way around is 2 * pi * r / r. So a radian is about 360 /(2 * pi) or 57.3 degrees.
Intuitive Guide to Angles, Degrees and Radians – BetterExplained
https://betterexplained.com/articles/intuitive-guide-to-angles-degrees-and-radians/
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Geometry: Why are there [math]2\pi[/math] radians in a circle ... - Quora
https://www.quora.com/Geometry-Why-are-there-2-pi-radians-in-a-circle
TL;DR: A full circle is [math]2 \pi[/math] radians by definition. This is in fact a possible defining equation for the constant [math]\pi[/math] itself. Deta...Degree/Radian Circle - Rice Math Department
math.rice.edu/~pcmi/sphere/drg_txt.html
Thus 2 radians equals 360 degrees. This means that 1 radian = 180/ degrees, and 1 degree = /180 radians. d(A,B) = R a /180, These formulas can be checked by noticing that the arc length is proportional to the angle, and then checking the formula for the full circle, i.e., when a = 2 radians (or 360 degrees).
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