w     l x w             w                 l x w 
                   l                                    l 
                                                         
                                                          a  
                                   b x h                               (a+b)h    
                  h                   2              h                      2
                  b                                       b  
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      What is the value of x?      6
                                   6
                                                   2
                   The area of this shape is 20cm .
                   What is the length, b ?
                                                         4cm
                                   b cm
                                                                       5
                                                                        5
          What is the perimeter of this shape?
              2.5cm   2.5cm
                  2 cm
                   7
                   7