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Ajutatima va rog :
Stabiliti daca punctele A,B,C sint coleniare,stiind ca:
a) AB=17cm,AC=3dm,BC=13cm.
b)AB=29cm,AC=420mm,BC=1,3dm.
c)AB=4dm,AC=15mm,BC=38,5cm.
d)AB=48mm,AC=6cm,BC=12cm.