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Answer

The area of the dotted trapezium at the bottom of the figure

= (8  + 4) * 12/2

= 72 cm²

The area of the small triangle with dotted line at the right of the figure

= 1/2 * 4 * 2.5 

= 5 cm²

Area of the original rectangular paper without folding

= 12 * 24

 = 288 cm²

Area of the figure = 288  – 72 + 5 = 221 cm²

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