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Daca ABCD este un trapez,AB || CD,m(A)=50 grade,iar m(C)=110 grade.Aflati masura celorlalte unghiuri.

Răspuns :

[tex]AB\parallel CD[/tex]
[tex]\Rightarrow m(\angle A)+m(\angle D)=180^{\circ}\Rightarrow m(\angle D)=130^{\circ}[/tex]
[tex]\Rightarrow m(\angle B)+m(\angle C)=180^{\circ}\Rightarrow m(\angle B)=70^{\circ}[/tex]