Rotational Inertia Problem-PLEASE HELP

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Rotational Inertia Problem--PLEASE HELP!!!!

Homework Statement



Figure 12-39 shows a rigid structure consisting of a circular hoop, of radius R and mass m, and a square made of four thin bars, each of length R and mass m. The rigid structure rotates at a constant speed about a vertical axis with a period of rotation of 1.0 s. Assuming R = 0.50 m and m = 3.0 kg, calculate the structure's rotational inertia about the axis of rotation

The figure is attached

Homework Equations



I of point mass = mr^2
I of hoop = mr^2 or .5mr^2
I of rod = 1/3 mr^2

The Attempt at a Solution



I tried to add the I of the hoop and two of the rods together (because the other two rods are parallel to the rotating axis) but nothing that I've tried really worked...
 

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Answers and Replies

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http://panda.unm.edu/Courses/Price/Phys160/p27-2.pdf" [Broken]
 
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