1. Open AutoCAD and create a polyline object as follows: Click "Draw," then "Polyline." (Polylines are chains of connected line segments and curves.) Click anywhere in the drawing window (aka viewport), and then drag. This action will define the first line.

2. Click again to complete the first segment and begin the next one. Continue clicking and dragging until you have at least three segments. Then, right-click and select "Close." This will make AutoCAD add a final segment, one that connects the last segment you drew with the first. Notice that you've created a polygon--a closed chain of edges that lies on a plane.

3. Shape the polygon. Click any of the polygon's points (aka vertices) to select the point. Then, drag anywhere in the viewport to move the point.

4. Begin adding a new vertex to the polygon: Click anywhere on the polygon to select it. Then, right-click and select "Polyline Edit."

5. Click "Edit Vertex" from the small pop-up menu, then click "Insert." Move your mouse to any location outside the polygon, then click the mouse. Notice the polygon now has a new vertex where you clicked.

6. Create a 3D view. Click the "View" menu's "Orbit" item, then click "Constrained Orbit." This action will let you rotate the viewpoint around the polygon.

7. Click anywhere in the viewport and drag upward slightly to view the polygon at a diagonal, downward angle. Right-click and select "Exit" to exit the orbiting mode.

8. Stretch the polygon, which is a 2D shape, into a 3D object. Click any part of the polygon to select it. Then, enter "Extrude" at the command prompt at the bottom of the screen. (Extrude means to pull or stretch a 2D surface into three dimensions.) Notice that the polygon has "jumped" from being 2D to 3D. Click the mouse to end extrusion mode.

9. Change to a view that prevents the edges at the back of the new object from being displayed: Enter "-visualstyles" at the command prompt. Then, select "set Current," and "Conceptual." Notice that the object's back edges are now invisible. (The "Conceptual" visual style applies a simple shading scheme to models so you can see them clearly.)

How to Calculate Area in AutoCAD:

1. Open AutoCAD and select "Open" in the "File" menu. Navigate to your project file and click "Open."
2. Draw a polyline around the surface you would like to calculate; type "Pline" in the command line and click the vertices of the surface and type "C" to close the polyline. Press the "Enter" or "Return" key on your keyboard.
3. Calculate the area of the surface enclosed by the polyline; type "Measuregeom" in the command line, type "Ar" and press "Enter" or "Return" for the area calculation, and type "O" and press "Enter" or "Return" to select the object to measure. Select the polyline drawn in Step 2; the area and perimeter of the shape will appear in the command line.
4. More information from http://ask.brothersoft.com/how-to-calculate-area-in-autocad-88611.html

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