I am looking to purchase a 20" square pan, as you can probably guess by the title. Anyway, the one on this site says that the pan is 20x20x2 so am I correct to assume that it is a 2" deep pan that is 20" on all 4 sides? I saw a pan on another site that it says their pan is 20x2 and that it is 20" in diameter. Are these the same size pans?
I am little math challenged at times so please forgive me! 
When you check your oven make sure you actually have a couple of extra inches around your cake pan for circulation, or it won't cook properly.
As for the cake pan sizes you describe I am seeing two different shape pans.
20"x20"x2" = length x width x height so you have a 20" square cake the is 2" deep.
but the 20"x2", 20" diameter would be a 20" circle, Diameter is used when talking about circles.
Hope this helps.
Leily
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