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Sine gives pi? (Posted on 2013-04-02) Difficulty: 2 of 5
Why does sin(1/5555555°) have a decimal that so closely resembles pi?

See The Solution Submitted by Jer    
Rating: 2.0000 (1 votes)

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Solution | Comment 1 of 2
Because 1/5555555 is extremly close to 1.8E-7, and combining the fact that lim sin(x) as x--> 0 is x (radians), so then sin(1/555555) radians is very close to 1.8E-7.  Then convert to degrees -->  pi/180.  and voila, you get pi*10^-9.

  Posted by Kenny M on 2013-04-02 08:59:29
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