You can make a v-fold - the Arizpe way

A regular 'V' fold is pretty easy to make. You just fold your paper in half and line it up on top of the gutter. Angle 'A' is the same as angle 'B'.

But to make an asymmetrical V fold is a little more difficult. I don't really understand it myself but here is a diagram that I find helpful.



Angle 'A' is not equal to angle 'B'.
You can make angle 'B' what ever you want.
To find angle 'A' just find the distance form the V fold to the gutter, angle 'D', then double it.

Then you have angle 'A'.

-SA