Secant line point a "tangent line" and in no points an "exterior line". A "chord" of a circle is the line segment that joins two distinct points of the circle. A chord is therefore contained in a unique secant line and each secant line determines a unique chord. In rigorous modern treatments of plane geometry, results that seem obvious and were assumed (without statement) by Euclid in his treatment, are usually proved. For instance, "Theorem (Elementary Circular Continuity)": If formula_1 is a circle and formula_2 a line that contains a point that is inside formula_1 and a point that is outside of
Circle Line Sightseeing Cruises September 11 attacks back to New Jersey. After US Airways Flight 1549 was forced to land in the Hudson River in 2009, Circle Line Sightseeing vessels were among the first to respond. Currently, Circle Line Sightseeing operates 8 vessels with an additional two under construction, including: The "Bronx", "Staten Island", and "Liberty" constitute Circle Line's new "Empire"-class boats, which claim to be state-of-the-art, and include modern amenities like digital screens and improved sound systems. Additionally, while she has been retired from service, the "Circle Line X" is retained by Circle Line, who claim to have "big plans" for the vessel.