I have always assumed that pie plate labeling was relatively straight forward, with only one dimension (the diameter) generally being given on the label. The main exception is if the plate/pan is of the deep-dish variety, in which case the depth is often given as well. However, standing in the dreaded Walmart, trying to find a pair of pie pans for the Pi-day pie crust experiment, I noticed something a bit peculiar; pie vessels that claimed to be the same size, did not appear to be the same size.

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