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Sagot :

Answer:

3ft x 6ft= 9ft  

9ft x 2= 18ft

20ft x 3ft= 60ft

60ft x 2= 120ft

20ft x 6ft= 120ft

120ft x 2= 240ft

240ft + 120ft + 18ft= 378ft

The surface area of the rectangular prisim is [tex]378ft^{2}[/tex]