The Big guns have spoken. . .I'll vote with them !
A more simplistic observation is true triangle are real pretty much equi-lateral { near equal all sides. }
Two of those "Perds", with the pinched bases might actually be a GOWER form. Quite old !
There are so many references now available for identification, from favorite free internet sites to hard copy books. You takes your choose of what works for you ! For a quick, early morning check of " is this a triangle? ". . . I just hit the most current money book !
It just rained in S TX for the first time in ages, surfacers are reporting good finds. Some better than others if they are walking the throw piles of long dead dugout sites !
Seems that if you take were to take a pic of an individual point, then we could answer specifically about it. A question about a pic with 10 points is a little confusing, give us a break.
Thanks for the ID on the Clear Fork Tehuacana/Mike, checked out some others on Texas Beyond History and I completely agree...any clue on the last pic of the reddish one?