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I can't figure out how to properly do this. I'm pretty sure you just multiply 8+12 times 4 and then multiply that by 1/2 but idk​

I cant figure out how to properly do this Im pretty sure you just multiply 812 times 4 and then multiply that by 12 but idk class=

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Answer:

Step-by-step explanation:

You can do it by adding the top and bottom together the dividing that by two (which does the same thing as timing by a half) the times the answer by the height

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