It is very improtant to colorcode!!

I would draw it just like this on cardboard, (time to use those tirangle drawing skills!),
then cut it out(utility knife, BE CAREFULL!).
TIP:  Use a steel rule or square to cut out the pieces.
Aluminum or plastic tend to get cut by the knife, if that happens,
the knife can "jump the straight edge", there goes the tip of your thumb!!
But, hot melt glue works pretty good to put it back on!
So, cut it out. Use it as a pattern, trace around it.
Make sure to mark where the corners of the equalateral triangle are.

Connect the points of the equalateral triangle.
Now, take the wide side of a framing square and
trace around the outside of that. This should give you 2" tabs.
Now, relieve the  tab ends at the tips of the isosceles triangles by drawing a line parallel to it's base.
For the tips of the equalateral triangle, just follow the lines through to the edge of the tabs.

For a dome make five, cut the outside edges including the tab reliefs.
For a sphere make twenty!

It's time to strip
(geodesic strip, that is)!

OK, this pattern starts with an equalateral triangle, too!
Do the isosceles triangles that rest on the equalateral triangle first.
When you do the last isosceles triangle, you must do one leg at (B) measurement
and one at (A), but use the same method to draw the triangle.
If you don't want to go to the trouble of making another pattern,
check this out!!!

After you make your patch surfaces.
Cut off one of the isosceles triangles(exactly on the line) from the first pattern!
 Rotate  it, and tape it on the side!
Use clear packing tape so you can switch it around!

Now trace the new pattern. Don't forget to mark the inside lines!

Draw the inside lines and put on the tabs as before!

Now, let's put them together!!Start by taking a clean pizza cutter and creasing all lines.
For a dome crease all lines from the same side, exept for the bottom of strips, crease them opposite.
For a sphere crease the tabs opposite of the triangle lines.
You'll need a box of Acco pronged fasteners for this part, although a good stapler might work.
Staples just don't come out so easy for disassembly.
For larger domes, I might suggest, nylon "toilet seat bolts".
The five geo-patches go first.
Lay out the five patch surfaces in a rough circle (wish I had pictures for this!).
Just grab any two adjacent edges and fasten them together,
it will remain flat until the last edge is fastened.
Fasten all the edges of the top triangles.
When you  pull up the last edge, that should make the top vertice pop out a little, COOL!
Now, do the lower edges of the patches. Starting to look like a dome , now!
This is an "inside" look.
Fasten the first geo-strip, A (red) edges up. The first edge lines up with the point of the triangle at the center of a pentagon, there should the joint of the upper two patches right there, so it's like three of the five triangles of the pentagon are coming together right there.
If you need help, I'm right here....