How to work out the percentage of a part's size relative to another part?

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1

Quick question,

I have these parts:

For the sake of explanation, Lets call the whole part ‘Original’ and the other two ‘Halves’

Screen Shot 2020-06-16 at 18.09.42
Screen Shot 2020-06-16 at 18.09.421116×996 516 KB

How would I work out the rough percentages of size of one of the halves relative to the original part, to the point I could say the one on the right is 20% of the original (Doesn’t have to be completely accurate given unions size’s are not accurate.)

2

Ok, solved this. For the sake of this being a document ill give my solution:

GetMass() Tells me the ‘mass’ of the part, I can then divide this by the mass of the original part to get my %.