3D SOLID

Hello,

I am new to solids and working with them.  I created a non symetrical, upside down pyramid shape which I want to be a solid but not sure how to convert the 3d breaklines into a solid.  For now I have used the "3F" command to make the sides a 3d face so at least I can see the shape as if it is a solid, but it is not.  Is there a quick way I can convert this odd shape into a 3d solid?

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Image may be NSFW.
Clik here to view.