Answer :

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The perimeter for a rectangle is the total distance around it. 
the distance from C to D is 6 units. 
The distance from D to A is 5 units 
The distance from A to B is 6 units 
The distance from B to C is 5 units 
Therefore the perimeter of the rectangle ABCD is
 6+5+6+5
11+11=22
Therefore the perimeter of this shape is 22 units