Question

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

Answer 1

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