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One ounce. That's four sheets of typing paper plus the envelope.Read more: What_is_the_most_a_letter_can_weigh_for_a_42_cent_stamp
No. The square is all on one flat surface, like a piece of paper, but a cube has height off of the paper. When you set the cube down on the piece of paper, the place where it touches the paper is a square, but there's a lot more to it than that.
Because if you gave more than one side the same letter - it would get confusing !