CUSTOM PATTERN MAKER - Chapter VII - pg 43
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  complete a C(lose)d polyline object. The computer will automatically draw a line segment from the last segment endpoint you have just SELECTed to the Start point, C(lose)ing the object. A C(losed) object has no Start point or Endpoint.
    The BASIC BLOCK patterns are drawn as C(lose)d polylines.  It is important to keep this in mind because the CUT command that you will use to “slash and spread” for flat pattern making will only work with a C(lose)d polyline.

3.1.4.6.  The A(rc) option  makes it possible to draw A(rc)ing lines. You can switch between straight and A(rc)ing lines as you draw a polyline.  TYPE A and CLICK ENTER before you SELECT your next Endpoint and this next segment will be an A(rc).  You will see that the function options change in the command line at the bottom of the screen:
                    Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width/<Endpoint of arc>:

These options allow you to control the size and shape of the A(rc).  

3.1.4.6.1.  The default <Endpoint of arc> allows you to drag the cursor until the arch looks the way you want and the CLICK to SELECT the endpoint of the A(rc).

3.1.4.6.2.  R(adius) allows you to specify the radius of the circle the arch would form if continued 360E. (Remember, the radius is ½ of the circle or arc’s diameter. If you SELECT the Endpoint of the arc with the cursor, the distance between the Start point and the Endpoint is actually the diameter.) If you TYPE R and CLICK ENTER and then type in the number for the size of the R(adius), the computer will ask:
Angle/<End point>:
You can just SELECT the Endpoint with the cursor.  If you TYPE A for A(ngle), the computer will ask:
Included angle:
The included angle would be the amount of degree radians around the circle that you wanted included in the arc. TYPE in that number (Example: 90, 170, 270) and CLICK ENTER. The computer will then ask for the
Direction of chord <282.84>: (NOTE: the number in the brackets < > is generated from your specific drawing situation and will not likely be the one here.).
The direction is the direction your previous line was traveling in and the number in brackets is based on the default method you specified when you set up the PREFERENCES for CPM for measuring degrees around a circle.  The default setting for the Templates places 0E at the 3 o’clock position, measures counter clockwise around the circle.  Therefore, the number in the brackets