UPSKILL MATH PLUS

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Classify the following shape and determine the adjacent vertices, adjacent sides and number of diagonals.
 
EX_5.1.png
  
1. The name of the above polygon is called a .
 
In polygon ABCDEFGHIJ:
 
2. The vertex C is adjacent to the vertex.
 
3. The side DE is adjacent to the side.
 
4The number of diagonals of the polygon is.