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Ip abcd-paralelogram
m(∡B)=75°
Cl:m(∡B),m(∡ C),m(∡ D)


Răspuns :

Dem
m(A)=180°-m(B)=180°-75°=105°
m(A)=m(C)=105
°
m(B)=m(D)=75
°