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<span> −7
20
20 square root 449 over 449
negative 7 square root 449 over 449</span>
The answer seems to be the third one which is 20 square root 449 over 449.
To find the surface area of the open net, you’ll have to find the area of the faces So, since there are 6 boxes you’ll have to find the area of the faces and add it up to find the surface area 10x4=40x4=160 3x4=12x2=24 160+24=184