Secant line a circle in the Euclidean plane, a line joining two of them would be a 2-secant (or "bisecant") and a line passing through only one of them would be a 1-secant (or "unisecant"). A unisecant in this example need not be a tangent line to the circle. This terminology is often used in incidence geometry and discrete geometry. For instance, the Sylvester–Gallai theorem of incidence geometry states that if points of Euclidean geometry are not collinear then there must exist a 2-secant of them. And the original orchard-planting problem of discrete geometry asks for a bound on the number of
Fife Circle Line Fife Circle Line The Fife Circle is the local rail service north from Edinburgh. It links towns of south Fife and the coastal towns along the Firth of Forth before heading to Edinburgh. Operationally, the service is not strictly a circle route, but, rather, a point to point service that reverses at the Edinburgh end, and has a large bi-directional balloon loop at the Fife end. The service includes the Edinburgh-Dunfermline stretch of the East Coast Main Line, which includes the world-famous Forth Bridge. On the Fife side, while this line hugs the coast, the circle is formed by a