You can construct the following three types of tangent circles using the Construct Circle dialog box (Insert | Feature | Constructed | Circle):
Tangent 2 Lines - This option constructs a circle tangent to two lines. The exact location is determined by the size of the circle and the direction of the lines. Type a Diameter value for the construction after selecting the two input lines, and then click Create. If PC-DMIS doesn't show the constructed circle where you expect it to be, change the direction of one of the lines.
Tangent 3 Lines - This option constructs a circle tangent to three input lines that form a triangle. Select the three input lines, and then click Create.
Tangent 3 Circles - This option constructs a circle tangent to three input circles. Select the three input circles, and then click Create. The tangent circle can either contain all three circles (circumscribed circle) or none of the three (inscribed circle).