1) The document discusses various properties related to circles, chords, tangents, and radii. It defines what a chord, secant, tangent and radius are with reference to a circle. 2) It proves several theorems about tangents including that the angle between a tangent and radius at the point of contact is 90 degrees and the angle between a tangent and a chord through the point of contact is equal to the angle subtended by the chord in the alternate segment. 3) It also demonstrates how to draw a tangent and secant to a circle parallel to a given line and proves that tangents drawn at the ends of a diameter are parallel.