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thirty-nine ten thousandths
That's a "central angle", but the part that really fascinates me is this: What would it look like if you hadan angle whose vertex was in the center of the circle and whose sides didn't intersect ? ? ?
x2 + y2 = 2
It will be the same angle subtended by its circumference.
(x-0)² + (y-0)² = r²