CUSTOM PATTERN MAKER - Chapter VII - pg 44
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  here is 282.84E.  The computer imagines a circle drawn around the Endpoint of your previous segment with the 0E to 180E diameter line running parallel to the X axis of the Drawing Page (horizontal). If the line segment you drew just previously was extended in the direction it was traveling in, it would intersect the circumference of the imaginary circle at the 282.84E mark.
If you want your arc to be drawn so that it follows the direction of the line you started, CLICK ENTER.  If you do not, you can TYPE in a different degree radian, or you can SELECT a point with your cursor.

(NOTE: We have gone into this depth of explanation because it helps orient your mind to how the computer deals with arcs and directions.  All the other function options for drawing arcs within the PLINE command are variations on this theme. You will find your own uses for these options as you grow more experienced with CPM.  While this A(rc) function in the PLINE command may seem like a good solution to creating scalloped edges, it is actually much more efficient to use the ARC command itself, using the Start, End, Radius variation.)



3.2.  USE THE SNAPTO SUB-FUNCTIONS TO FIND POINTS ACCURATELY

    The SNAPTO functions allow you to select commands that assure "bit dot" accuracy in the placement of your line "VERTEX" points.  Use the SNAPTO functions to ensure that the slash line begins at a mechanically specific point on the seam line.  For the TRIM command to work you must be sure that the "connecting" lines accurately touch the seam line segments that you plan to TRIM away.
    The Snap functions are found on the SNAPTO pop-down menu. They are also found on an a pop-up window that is activated by using the SHIFT key and the RIGHT MOUSE BUTTON.  Try to get into the habit of using the SHIFT  -  RIGHT CLICK method of accessing the SNAPTO functions because it will save you time.

3.2.1.   After engaging the PLINE command, before SELECTing your point on the screen,  SELECT the SNAPTO functions  NEAR(EST) E(ND OF), INTERS(ECTION), MID(POINT) or PERP(ENDICULAR), from the SNAP TO pop-down menu, as is appropriate.  You will see the command prompt change to:
Start point: inters of: (or end of: or whatever you have chosen.)

3.2.2.  After you have selected SNAP TO INTERsection command you will discover that, when you move the cursor and make the CROSS-HAIRS approach the point where you want your line to be, a bright magenta X appears at the nearest vertex.  CPM does this to show you the point it will SNAP TO if you click SELECT at that moment.  The computer will find the exact VERTEX the SNAP TO command specifies without the CROSS-HAIRS being exactly close to where the point is.  As long see the magenta X, the computer will find the exact vertex point. Each of the SNAP TO options has its own little magenta symbol that indicates the vertex point it will SNAP TO.