well it depends there diffrent size envolpes for diffrent size cards or envolopes. sorry.
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rigid
13 by 6
7x75=525
Yes, it is the same for the same weight. Both are considered 'oversized' mail or 'flats' and cost more than a normal business envelope. the current rate would be 88 cents for the first ounce and 17 cents for each additional ounce.
The length of a radius is not the length of a diameter. The diameter is two times the length of the radius.