Triangles for mirror cell, help

Can someone tell me how to translate this diagram so I can lay out a template to cut the steel for the triangles? What is a vertex? Thanks
This is for a 12.5 btw

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The diagram assumes that you are bulding flat triangles. That is NOT the most stable approach.

Far more stable figures are produced by building with folded sides. Cut your forms with an extra 1/2" or so around the outside of the diagrammed cut-outs. Then cut the extra at the ends and fold the 1/2" down to 90-degrees.

The stability goes up by more than an order of magnitude.

All you have to do is get the holes the right distances from each other. A ruler, a compass, aircraft snips, a punch, and a drill are all you need. A small vise eases bending the edges.

BTW: PLOP downloads free. You can build a 27-point with 14-guage sheet and never look back.

There's easy ways to do the pivots, too..... ;^)

You might want to consider a six point cell for ease of construction.
http://users.telerama.com/~mdholm/atm/cells/6point.html