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PRIMITIVE CONCEPTS

- - - - SEGMENT
        
        IT'S A PART OF A LINE DEFINED BY TWO POINTS BELONGING TO IT, CALLED SEGMENT EXTREMS. TWO OR MORE SEGMENTS ARE NAMED :
        
        ADJACENT
        
        IF THEY ARE CONSECUTIVE AND IF THEY LIE ON THE SAME LINE
        
        CONSECUTIVE
        
        IF THEY HAVE AN EXTREM IN COMMON
        
        POLYGONAL
        
        IT'S A GEOMETRIC FIGURE
        
        3 more items...
      - HALF-LINE
        
        EACH OF THE TWO PARTS IN WHICH A LINE IS DIVIDED BY A POINT BELONGING TO IT, CALLED
        ORIGIN OF THE HALF-LINE. A HALF-LINE HAS A START POINT BUT IT HASN'T AN END POINT (IT GOES
        TO INFINITY)
        
        ANGLE
        
        IT'S A PART OF A PLANE INCLUDED BETWEEN TWO HALF-LINES , CALLED ANGLE SIDES AND THEIR COMMON ORIGIN IS NAMED ANGLE VERTEX
        
        RIGHT (IT'S 90°)
        
        REFLEX (IT'S 270°)
        
        FULL ROTATION (IT'S 360°)
        
        CONVEX
        
        IT DOESN'T CONTAIN THE EXTENSIONS OF ITS SIDES
        
        CONCAVE
        
        IT CONTAINS THE EXTENSIONS OF ITS SIDES
        
        CONSECUTIVE
        
        THEY HAVE A HALF-LINE AND THE ORIGIN IN COMMON
        
        ADJACENT
        
        THEY ARE CONSECUTIVE AND THE UNCOMMONS SIDES LIE ON THE SAME LINE
        
        ACUTE
        
        IT'S LESS THAN 90°
        
        OBTUSE
        
        IT'S GREATER THAN 90° BUT LESS THAN 180°
        
        STRAIGHT (IT'S 180°)