Segments of Tangents, Secants and Chords

External Secant Segment: That part of a secant segment exterior to the circle

Secant Segment: That part of a secant thta extends from an external point that includes a chord of the cirlce.

Tangent Segment: That part of a tamgent that extends from an exterior point to the point of tangency.

Theorem 10-15: If two chords intersect inside a circle, then the product of the lengths of the segments of one chord equals the product of the lengths of the segments of the other chord.

Theorem 9.5.2: If two secants intersect outside a circle. the product of the lengths of one secant segment and its external segment equals the product of the lengths of the other secant segment and its external segment. (Whole x Outside =Whole x Outside)