title: How to use excel data to find period
body: <p>I have three Excel columns of data from an experiment with a pendulum: time, angle displacement, and angular velocity. I was wondering if there is a way in Excel to calculate and then graph the period (and, if possible, display the function for the graph)... I realize it's kinda a dumb question. I'm still new at Excel. 
  Thanks for any pointers u can give!</p>