[GRASS-user] how to identify concave and convex polygones ?

[Michaël Rabotin]

Hi everybody
I search to identify in a polygons vector which polygon are concave or
convex.
I know that is it possible on working with diagonals (in a concave polygon,
some diagonals are outside the polygon).
Is it a GRASS command who already do it ?
Thanks

-- 
M.
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