The intersection functions generate construction points and add them to the construction buffer. Here the intersections are calculated between two circles. The circles can be searched in the data position. In addition the middle base of a circle (curve) is to be selected (with #P digitize). Alternatively a circle can also digitize about the centre (with #C) and a base on his extent are determined (with #P digitize or over the command window give a radius). If the circles cut themselves, the intersections are filed in the construction buffer. On the (thought) circumference an arc with a corner of 10 ° is drawn. However, these auxiliary constructs are extinguished with the new drawing of the announcement again.
Also about the suitable button in the construction menu available.