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**A rod suspended on its end and acting as a physical pendulum swings with a period of 1.74 s. What is its length? (g = 9.80 m/s2)**

Ok so in order to solve this I need to use the physical pendulum formula:

T = 2Pi * sqrt (I / mgh) ==> I am looking for 'h'

To get 'h' I need to first calculate 'I' which requires mass for a rod.

So, taking it from here I'm not sure where to begin. I've tried rearranging the formulas I've been given with no luck - any ideas?