adjacent triangles

An initial triangle...Click on a tile to add tiles as neccessary. I need to give the triangle some edges to push out, I guess? 8-P
Either just pop out the open adjacent edges or subdivide the triangles? I want each tile to keep track of it's neighbors...

Input a seed, please (the default is tau, or 2 pi), or click the button for a random seed number.

Random seed is 0.96825507073555

The world is 43518.6 km across, surface area: 602.83 m. km^2, HR%: 56.3%, 339.86 m. km^2 ocean and 262.97 m. km^2 land.
91.98 m. km^2 target land area

polygon(214px 51px, 163px 0px, 217px 0px)
Land area: 13.77 m.km^2, 2.28% of total surface area
Lat: 17, Lon: 198, circ by lat: 106 px