Hendecagon of a regular hendecagon is still impossible even with the usage of an angle trisector. It can, however, be constructed via neusis construction and also via two-fold origami. Close approximations to the regular hendecagon can be constructed, however. For instance, the ancient Greek mathematicians approximated the side length of a hendecagon inscribed in a unit circle as being 14/25 units long. The following construction description is given by T. Drummond from 1800: On a unit circle: The "regular hendecagon" has Dih symmetry, order 22. Since 11 is a prime number there is one subgroup with dihedral symmetry: Dih, and 2
Many a Slip (radio series) murder mystery round with the Many a Slip detective; travelogues of different countries and the Many a Slip chef and his way of cooking with ingredients that no sane chef would use. For each series the chairman kept a running total of how many games each team had won and in the last show he announced which team had won the series. In the mid sixties it was tried out on TV for one series. Peter Haigh took over as chairman and Steve Race's contribution was replaced by a spot the mistakes in the picture round, but it was deemed