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A. 1.618

http://upload.wikimedia.org/math/5/a/a/5aa04824df4e09c1ae352502bdee9c92.png formula!
and a wiki

http://en.wikipedia.org/wiki/Pendulum

2*pi*sqrt(L/g) L is length and g is gravity

A 1.61 when you plug in your formula

thanks Yall