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.
 SEE ALSO : Chapter 3: Playing With Numbers

 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 with all its sides equal and all its angles equal is called a regular polygon.
 A figure, every point of which is equidistant from a fixed point is called a circle.
 The fixed point is called its centre and the equal distance is called its radius.
SEE ALSO : Chapter 6: Integers
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