Serlio 4
| 1 | Construct two circles that run through each other centers. |
| 2 | Define the intersection points N and O of both circles. |
| 3 | Connect the midpoints D and E with the intersection points N and O and define the points 1, 2, 3 and 4. |
| 4 | Construct the circular arcs from 3 to 4 with center D and from 1 to 2 with midpoint E. |
