I know but we're talking to the definition of cubit.Look, if you're going to jump into a conversation, try and understand what is being said.
A rectangular cuboid.
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You take the length and you multiply it by the height and multiply it by the width then you get the volume.
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A boat, if you take the length, and multiply it by the width and multiply it by the height, you WILL NOT GET THE VOLUME because the length, width and height are not CONSISTENT.
I wrote nothing about the size of the Ark. Do you want to argue about the size of myth?