I don’t know about area but volume should be top plus base times height over two. I know it’s not a funny response but it’s not political either.
Not as controversial as #2+2=5 either. ...
That principle would say that a pyramid would have volume = height*base_area/2 but it's actually height*base_area/3.
There is a general formula that works for lots of solids which is
Volume = (area_top + 4 * area_middle + area_bottom)*height/6
This gives the correct volume for a cylinder, a cone and a sphere.
I've got no idea whether that works for the skudoid.