16 point star
 

Some one gave me a 16 point Lone Star to finish for them. How do i figure the outside triangles?

You have 16 points around the edges?

Does it look basically like this??
https://quiltsmart.com/queen-broken-lone-star/

In this case, all the setting triangles (and squares if you use them) are based on regular right/90 degree angles. When you look closely at the "squares" they were mostly put together with the top in wedges, but you can fit in as well.