Basically you need to break the area calculations down into geometric sections (squares, triangles, circle sections) that you can calculate the area of, then add them all up to get the total area. Multiply that by the height for total volume.
Or you can do what I do. Draw the plan in your handy dandy CAD software and let it calculate the area for you. Saves my head from hurting so much.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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