Finding mass moment of inertia about point E

[master117]

It must be for any value of the distances (work with letters only), Every distance is known, mass is also known I just can't figure out how to do it if anyone can help me I would really apreciate it. Take also in consideration that we must use point E as the reference

Here is the image, in case you can't see it, is also attached

 

[tiny-tim]

welcome to pf!

hi master117! welcome to pf!

moment of inertia is additive, so find the moment of inertia of two pieces of the same material, with the shape of the holes, then subtract that from the moment of inertia of the plate as if it had no holes