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Fie ABCD un patrulater convex. Daca :

a) m(A)=55 grade , m(B)=75 grade si m(C)=120grade aflati m(D)

b) m(B)=83 grade, m(C)=90grade, si m(D)=102grade aflati m(A)

c) m(C)=67 grade, m(D)=110grade, si m(A)=81grade aflati m(B)

Dau coronita daca mi-l faceti repede.