9.5

//Tangent segment:// A line that touches a circles rim without going in and starting from a point outside of the circle.
 * Vocabulary:**

//Secant segment:// A line that goes inside a circle with the starting point outside.

//External secant segment:// The part of the secant segment that lies between the beginning point and the point where it enters the circle.

//Chord:// A chord is the line segment joining two points on a curve.


 * Theorem one:** If two secants intersect outside a circle from the same external point, then the segments are equal in length.


 * Theorem two:** If two secants intersect outside of a circle, then 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)


 * Theorem three:** If a secant and a tangent meet outside a circle, then the product of the lengths of the secant segment and its outside segment equals the length of the tangent segment squared. (whole x outside = tangent squared)


 * Theorem four:** If two chords meet 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.

I did the circle. If you totally ignore that the tracks bend off, and pretend that they're going straight, then those are tangent lines

(below picture) EX: WxO=T² 6xO=8² 6xO=64 (6xO)/6=(64/6) 0=10 ²/3 O=/````10 ²/3```` (square root of 10.66667) O is about 2.58