Open up the Create Nulls From Paths script (in the Window menu).
Select the path you’d like the shapes to follow.
Press the Trace Path button.
It’ll give you a null with a control to put it wherever you’d like along that path (keyframed, so you’ll want to turn off the keyframes [press U to reveal all keyframed properties]).
Parent a triangle to that null and you’re done!
Repeat for as many triangles as you need.
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