RegularNGons numerical search
This applet helps you finding exact or approximate values among lengths of segments of the second kind in a regular polygon or polygram. Set first the number of sides (n), the way the polygon or polygram looks (k), and the start case (s). A preprint can help you learning the concept of the numbering of the cases.
Then the number RS should be set to search for an exact or approximate value among the appearing lengths. By default it is set around π, and the maximum error ε is set to 0.0001. Now by enabling the checkbox Search the numerical search begins...