A comune of its province, located at the southern entrance of the Strait of Messina, is to this day called 'Scaletta Zanclea'. In the early 5th century BC, Anaxilas of Rhegium renamed it Messene (Î¼ÎµÏÏÎ®Î½Î·) in honour of the Greek city Messene (Greek: Î¼ÎµÏÏÎ®Î½Î·).
Definition of Arc. An Arc is a curved line that is a part of a circle. An Arc is a part of the circumference of a circle.
Definition of Circle. Definition: A circle is the set of all points that are the same distance, r, from a fixed point. General Formula: X 2 + Y 2 =r 2 where r is the radius. 1  Unlike parabolas, circles ALWAYS have X 2 and Y 2 terms. 2  X2 + Y2=4 is a circle with a radius of 2 (since 4 =22). 3  Remember that a circle is a locus of points.