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let V1=(2,2,0), V2=(-1,2,1), V3-(1,1,4). There three vectors determine a parallelepiped. P draw it.

(a) (this is the one that is giving me trouble) Determine the length of its main diagonal. (from origin to opposite vertex).

I can't seem to figure out what it means from the origin to the opposite vertex. I've drawn the graph and originally I thought I would have to take the determine of two vectors then find the length of it. I'm just pretty lost here. Once I get this part and I know what its asking of me I can get the other problems easily.