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Rectangles are two-dimensional and you've given us three dimensions, so we'll assume it's some kind of rectangular prism.

2 x 12 x 10 = 240

2 x 12 x 8 = 192

2 x 10 x 8 = 160

240 + 192 + 160 = 592 square cm

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Q: What is the surface area of rectangle 12cm height 10cm width 8cm length?
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