barycentre (A₁:Point,…,A_n:Point )

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barycentre (T:Triangle )

barycentre(T)=barycentre(T₁,T₂,T₃)

barycentre (P:Poygonal|Poygon )

b:=barycentre(polygone(p₁,p₂,...,p_n))=barycentre(p₁,p₂,...,p_n)

b:=barycentre(polygonale(p₁,p₂,...,p_n))=barycentre(p₁,p₂,...,p_n)