The segments of a secant segment and a tangent segment which share an endpoint outside of the circle. The product of the lengths of the secant segment and its external segment equals the square of the length of the tangent segment.
Segments of Secants and Tangents Theorem is a free educational video by Jessie Mason.It helps students in grades 9,10,11,12 practice the following standards HSG.C.A.4.
1. HSG.C.A.4 : Construct a tangent line from a point outside a given circle to the circle.