Which of these shapes has an area that is different from the rest?

Sol:

Option A)
Area of Square = a²
                         = 2²
                        ​ = 4 cm²

Option B)
Area of rectangle 1 = lxb
                               = 2x1
                               = 2 cm²
Area of rectangle 2 = lxb
                               = 2x1
                               = 2 cm²
Total Area              = Rectangle 1 + Rectangle 2
                               = 2 cm² + 2 cm²
                             =  4 cm²
Option C) 
Area of square 1    = a²
                              = 1 cm2
Similarly area for Square 2, Square 3 and Square 4 = 1 cm²

Total Area of the Square = area of (Sq1 + Sq2 +Sq3 +Sq4 )
                                      = 1 cm² + 1 cm² +1 cm² + 1 cm²
                                      ​= 4 cm²
Option D) 
Area of Triangle 1 = 1/2 x HB
                             = 1/2 x (2 cm x 2 cm)
                           = 2 cm²

Area of Triangle 2 = 1/2 x HB
                             = 1/2 x (2 cm x 2 cm)
                           = 2 cm²
Total Area of Triangle = 2 cm² + 2 cm²
                                    ​= 4 cm²

Hence Option E is the correct answer.