Answer:
252 m^2
Step-by-step explanation:
Surface Area of a rectangular prism is A = 2(w*l + l*h + h*w)
A = 2(3*12 + 12*6 + 6*3)
A = 2(36 + 72 + 18)
A = 2(126)
A = 252 m^2
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