by

Frances LeVangia

This envelope can be folded from a square or a rectangle.

Using the folowing formula, you can calculate what size paper

you need to start with in order to fold an envelope of a certain size.

a = hight of finished envelope

b = width of finished envelope

A = hight of paper

B = width of paper

**For example:**

If you want the finished envelope to be 3 inches by 5 inches (a = 3
and b = 5),

then

A = (a x 16) / 5 = (3 x 16) / 5 = 9.6 inchesSo, the starting sheet of paper should be 9.6 inches high and 7.4 inches wide.B = ((a x 4) / 5 ) + b = ((3 x 4) / 5 ) + 5 = 7.4 inches

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