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A line segment corresponds to the shortest distance between twopoints. The line segment joining points A and B is denoted as AB oras BA. A ray with initial point A and a point B on it is denoted asAB . Line AB is denoted as AB . Two distinct lines in a plane that cross at a point are calledintersecting 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 iscalled a quadrilateral. A polygon with all its sides equal and all its angles equal is called aregular polygon.
• 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
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