RE: Math mini-contest problem for Day 26 on D.Buzz for February 2021 😎
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This can be found by using the perimeter of the cake minus the perimeter of the side with no icing. The reason why I used the perimeter is because this where the icing is.
4(x+y+z) - 2(x+y)
4(6+8+5) - 2(6+8) = 76-28=48.
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I think you're over counting the corners.
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I might be but I am too lazy to check. I kind of just based on it on easy way to calculate. It's late at night.