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An object which is 3 units by 4 units by 10 units has six faces, three pairs of 2.

2 of them are 3 x 4

2 of them are 3 x 10

2 of them are 4 x 10

This equals

2 @ 12 square untis

2 @ 30 square units

2 @ 40 square units

which adds up to 12+12+30+30+40+40 = 164 square units of surface area

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Q: What is a total surface area of an object that is 3 by 4 by 10?
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