How do I find the surface area of a triangular prism whose bases are different dimensions?

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I am trying to determine the surface area of the main building of the famous Burj Al Arab in Dubai, but the shape of the building is quite awkward - as it was made to resemble a ship's sail. Both the top and bottom bases are triangular, however, the bottom base has much longer sides. Thus, there is a curve formed. My issue is, how do I approach to solve this? Is there a formula?

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Height: 197.5m