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DAU COROANA
A,B,C,D - coliniare distincte
AB ≡ CD
BC = 8cm
AD=20cm
Aflati AB,CD,AC,BD.


Răspuns :

AB+BC+CD= AD, dar AB=CD=> 2AB+8=20=> AB-=6=> CD=6; AC=14, BD=14 I----------------I-------------------------I----------------I A. B. C. D 8