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Answer:
The answer is 1700cm²
Explanation:
The formula is A=2(wl+hl+hw)=2(5*20+30*20+30*5)=1700cm²
1200+300+200=1700 cm^2
multiply each of the dimentions by each other such as 30 cm by 20 cm to get the surface area of one part, do this for each of the sides.
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