Hello all. Using current Draftsight V1R3.1, I generated a layout using two lines drawn tangent to two circles of different radius. Next, I trimmed the circles inside the figure at the line endpoints. Picking entities and referring to the Properties Palette provided arc & line segment lengths.  There appeared to be an error, and when the layout was dimensioned, one of the two arc dimensions differed from the arc length shown in the Properties Palette. (the dimension was correct; the value given in Properties Palette was incorrect.)  To complicate the matter, when I repeated the exercise with a slightly different distance between the arc center points, the error did not occur. (Will attempt to attach dwg file. ) Just posting this as a FYI, but any comments will be welcome. Thanks.