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Exercise 11.1 (Solutions)

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m\angle C$ (Opposite angles of parallelogram)\\ $\Rightarrow \,\,\,\,m\angle C=50^\circ$ </panel> </col><... \begin{align} & m\angle B =m\angle D=40^\circ \\ \Rightarrow \,\,\,\,\,\,\,\,\, & m\angle D=40^\circ \en... } Also \begin{align} & m\angle C=m\angle DAB \\ \Rightarrow \,\,\,\,\,\,\,\,\, & m\angle C=140^\circ \e