Learn to clear up issues with chords. A chord is a line that has its two endpoints on the circle. A chord passing via the middle of the circle is refered to because the diameter of the circle. A chord divides the circle into two parts: main and minor segments and in addition divides the cirumference of the circle into the most important and the minor arc.
When two chords intersect inside a circle, the connection between the 2 chords is that the product of the lengths from the purpose of intersection to the 2 endpoints for one chord is the same as that of the opposite chord.