I assume you are talking about a rectangular prism.
Surface area is 2(l * w + l * h + w * h) = 2(18 * 12 + 18 * 15 + 12 * 15).
Crystal F.
asked 06/14/21I assume you are talking about a rectangular prism.
Surface area is 2(l * w + l * h + w * h) = 2(18 * 12 + 18 * 15 + 12 * 15).
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