Secant is derived from the cosine ratio. Source: en.wikipedia.org. We will now show that a secant line that intersects both of the concentric circles creates two congruent segments between the two circles.. Secant-Secant Power Theorem: If two secants are drawn from an external point to a circle, then the product of the measures of one secant’s external part and that entire secant is equal to the product of the measures of the other secant’s external part and that entire secant. Now when two secant segments have a common endpoint outside a circle, the product of the measures of one secant segment and its external part is equal to the product of the measures of the other secant and its external part. In the case of a circle, a secant will intersect the circle at exactly two points.A chord is the actual line segment determined by these two points, that is, the interval on the secant whose ends are at these positions. In a right-angled triangle, the secant of any angle will be the ratio of the length of the hypotenuse and the length of the adjacent side. There are basically five circle formulas that you need to remember: 1. Two congruent circles with center at point O are intersected by a secant. Formulas for Angles in Circles Formed by Radii, Chords, Tangents, Secants Formulas for Working with Angles in Circles (Intercepted arcs are arcs “cut off” or “lying between” the sides of the specified angles.) Tangent and Secant Identities on a Unit Circle; Tangent and Secant Identities on a Unit Circle. Now, if two secants are drawn from the external point such that each secant touches two points of the circle. The Formula for Secant Secant Secant Theorem. Circular segment. It has a period of 2 \pi, similar to sine and cosine. In formulas, it is abbreviated as ‘sec’. A secant is a line that interest a circle (or any other curved line) at two or more point. 2. Tangent Secant The Types of Circles and Lines We will be Looking At: The Actual Formulas The Easy Way To Remember It Case 1: Let us select an external point somewhere outside the circle. By Mary Jane Sterling . In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off" from the rest of the circle by a secant or a chord.More formally, a circular segment is a region of two-dimensional space that is bounded by an arc (of less than 180°) of a circle and by the chord connecting the endpoints of the arc. Secant of a circle formula can be written as: Lengths of the secant × its external segment = (length of the tangent segment)2. (Whew!) In geometry, a secant of a curve is a line that intersects the curve at a minimum of two distinct points. Now, the formula for tangent and secant of the circle could be given as: PR/PS = PS/PQ. A secant is a line that intersects a circle at two points, rather than a tangent that only intersects at one point. Tangent Theorems. 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