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The Pline is a closed polygon by the way
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I have successfully created a surface in autoCAD from contours lines (top of model). I want to create a second surfaced composed of a single rectangular layer (already created by a polyline). &nbsp;<br />
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My question is <br />
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1) how do I convert this simple pline into a surface<br />
2) How do I measure the volume found between these two surfaces?<br />
<br />
I am a beginner so step by step is much appreciated.
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I have successfully created a surface in autoCAD from contours lines (top of model). I want to create a second surfaced composed of a single rectangular layer (already created by a polyline).  

My question is 

1) how do I convert this simple pline into a surface
2) How do I measure the volume found between these two surfaces?

I am a beginner so step by step is much appreciated.

Create Simple surfaces in AutoCAD and measure volume within these surfaces

Computer-aided design (CAD) is the use of computer systems to aid in the creation, modification, analysis, or optimization of a design. CAD output is often in the form of electronic files for print, machining, or other manufacturing operations. CAD software for mechanical design uses either vector-based graphics to depict the objects of traditional drafting, or may also produce raster graphics showing the overall appearance of designed objects. As in the manual drafting of technical and engineering drawings, the output of CAD must convey information, such as materials, processes, dimensions, and tolerances, according to application-specific conventions.