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The angle of 1" (second of arc) in a radian is equal to:
 
(1) 4.85 × 10–4
(2) 4.85 × 10–6
(3) 1.75 × 10–2
(4) 1.75 × 10–4
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1 Answer

 
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A minute of arc is \(π\over 10800\) of a radian.

A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, is \(1\over60\) of an arcminute, \(1\over3600\) of a degree, \(1\over1296000 \)of a turn, and \(π\over648000\) (about \(1\over206369\))

so answer is,

(2) 4.85 × 10–6

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