Extruded object turns out as hollow
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Hi, I'm new to AutoCad and I wanted to use the 3D modelling tools to help solve one of my homework questions.
I want to find the volume of this object and I've tried extruding the surfaces but it only produces a hollow shape. I've tried extruding the uneven surface (the top shape) and slicing it using the XY plane of the bottom flat surface and it still turns out as hollow. I think this is due to using 3D polylines.
I've attached the dwg file of my attempts.
Any help would be appreciated 🙂