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Exercise 11.1 (Solutions)

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$m\angle B=m\angle D=130^\circ$ We know that\\ \begin{align} & m\angle A +\,\,m\angle B=180^\circ \\ &... , $m\angle DAB=?$, $m\angle C=?$, $m\angle D=?$ \begin{align} & m\angle DAM+m\angle DAB=180^\circ \\ & 4... circ \\ & m\angle DAB=140^\circ \end{align} Also \begin{align} & m\angle DAB+m\angle B=180^\circ \\ & 140... 0^\circ \\ & m\angle B=40^\circ \end{align} Now \begin{align} & m\angle B =m\angle D=40^\circ \\ \Righta