HOW TO DRAW A VENN DIAGRAM

To draw a Venn diagram, first, the universal set should be known. Now, every set is the subset of the universal set (U). This means that every other set will be inside the rectangle which represents the universal set. 
    
So, any set A (shaded region) will be represented as follows:
Fig 1
Where U is a universal set. 
    
    We can say from fig. 1 that

    
    A ∪ U = U

    
    All the elements of set A are inside the circle. 
    Also, they are part of the big rectangle which makes them the elements of set U. 
     
    The universal set (U) is usually represented by a closed rectangle, consisting of all the sets. 
    The sets and subsets are shown by using circles or oval shapes.
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