The intersections are calculated between a straight line and a circle. It Just is defined by two points. The function searches the next base to the digitized point in the data position. The circle (bent) can be also searched in the data position. In addition the middle base of a circle (curve) is to be selected (with #P digitize). Alternatively the circle can also digitize about the centre (with #C) and a base on his extent are determined (with #P digitize or give a radius). Cuts Just the circle, the intersections are filed in the construction buffer. The intersections are also shown in the announcement. A line is drawn by the starting point of the straight lines by both intersections. On the (thought) circumference an arc with a corner of 10 ° is drawn. These auxiliary constructions are extinguished with the new drawing again.
Also about the suitable button in the construction menu available.