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Exercise 11.1 (Solutions)

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gle B=m\angle D=130^\circ$ We know that\\ \begin{align} & m\angle A +\,\,m\angle B=180^\circ \\ & m\ang... {130}^{\circ }}\\ & m\angle A={{50}^{\circ }}\end{align} Also we have $m\angle A=m\angle C$ (Opposite an... ngle DAB=?$, $m\angle C=?$, $m\angle D=?$ \begin{align} & m\angle DAM+m\angle DAB=180^\circ \\ & 40^\cir... 0^\circ- 40^\circ \\ & m\angle DAB=140^\circ \end{align} Also \begin{align} & m\angle DAB+m\angle B=180^\