Secant line 3-secants of a finite set of points. Finiteness of the set of points is not essential in this definition, as long as each line can intersect the set in only a finite number of points. Secant line In geometry, a secant of a curve is a line that intersects the curve in at least two (distinct) points. The word "secant" comes from the Latin word "secare", meaning "to cut". In the case of a circle, a secant will intersect the circle in exactly two points and a chord is the line segment determined by these two points, that is the
Area of a circle approximation among rational numbers with denominator up to 113. The number ⁄ is also an excellent approximation to , better than any other rational number with denominator less than 16604. Snell proposed (and Huygens proved) a tighter bound than Archimedes': This for "n" = 48 gives a better approximation (about 3.14159292) than Archimedes' method for "n" = 768. Let one side of an inscribed regular "n-"gon have length "s" and touch the circle at points A and B. Let A′ be the point opposite A on the circle, so that A′A is a diameter, and A′AB is an inscribed triangle