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Exercise 11.1 (Solutions)

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}}-{{130}^{\circ }}\\ & m\angle A={{50}^{\circ }}\end{align} Also we have $m\angle A=m\angle C$ (Oppos... B=180^\circ- 40^\circ \\ & m\angle DAB=140^\circ \end{align} Also \begin{align} & m\angle DAB+m\angle B... le B=180^\circ-140^\circ \\ & m\angle B=40^\circ \end{align} Now \begin{align} & m\angle B =m\angle D=... htarrow \,\,\,\,\,\,\,\,\, & m\angle D=40^\circ \end{align} Also \begin{align} & m\angle C=m\angle DA