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The number 206265 can be used to convert between arcseconds (") and radians (1 radian =...

The number 206265 can be used to convert between arcseconds (") and radians (1 radian = 2062652"). This number, however, is also the conversion between an Astronomical Unit (AU) and a parsec (pc); 1 pc = 206265 AU. Please explain in detail, with a diagram, why these numbers are the same

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