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the answer i got was 1,088.

SA = (12 x 5 x 2) + (20 x 5 x 2) + (12 x 20) + (0.5 x 12 x 9 x 2) + (20 x 11 x 2)

SA = 120 + 200 + 240 + 108 + 440

SA = 1,108 in²

The answer you got was incorrect.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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