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An ant positioned on the very edge of a Beatles record that is 13.80 cm in...

An ant positioned on the very edge of a Beatles record that is 13.80 cm in radius revolves through an angle of 115.0o as the disk turns. The path length is 27.70 cm.

  1. What is the magnitude of the ant's displacement?

(I have gotten an answer of 27.18cm and 27.69cm. Both of these answers are wrong.)

Thank you for your help!

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