Giả sử: $a∩AB≡D$
Qua $A$ kẻ $hk//a$ ($Ah$ nằm bên trái, $Ak$ nằm bên phải)
$→hk//a//BC$
Vì $hk//BC$
$→\begin{cases}\widehat{B}=\widehat{BAh}=70^\circ\\\widehat{C}=\widehat{CAk}=50^\circ\end{cases}$
mà $\widehat{BAh}+\widehat{CAk}+y=180^\circ$
$→y=180^\circ-70^\circ-50^\circ=60^\circ$
Vậy $y=60^\circ$
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