Main Concepts And Results A line segment corresponds to the shortest distance between two points. The line segment joining points A and B is denoted as AB or as BA. A ray with initial point A and a point B on it is denoted as AB  Line AB is denoted as AB Two distinct lines in a plane that cross at a point are called intersecting lines, otherwise they are called parallel lines. Two rays with a common initial point form an angle. A simple closed curve made of line segments only is called a polygon. A polygon of three sides is called a triangle and that of four sides is called a quadrilateral. A polygon…