Okay, let's try a harder one. Suppose that we locate the center of mass of the triangle -- I've marked it with the "X" in the figure below.

- What's the moment of inertia of the triangle spun around this point?
- What is the KE of the structure if it spins at 12 degrees per second?
- How many RPMs are required to give the structure a kinetic energy of 1000 Joules?

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