Answer:
\[x={{50}^{o}}+{{70}^{o}}\] \[\left| \begin{align} & \text{The exterior angle of a triangle i equal } \\ & \text{to the}~~\text{um of it two interior oppoite angle} \\ \end{align} \right.\] \[\Rightarrow \] \[x={{120}^{o}}\] (ii) \[x={{45}^{o}}+{{65}^{o}}\] \[\left| \begin{align} & \text{The exterior angle of a triangle i equal} \\ & \text{to the um of it two interior angle} \\ \end{align} \right.\] \[\Rightarrow \] \[x={{110}^{o}}\] (iii) \[~x={{30}^{o}}+{{40}^{o}}\] \[\left| \begin{align} & \text{The exterior angle of a triangle i equal to} \\ & \text{the um of it two interior oppoite angle} \\ \end{align} \right.\] \[\Rightarrow \] \[x={{70}^{o}}\] (iv) \[x={{60}^{o}}+{{60}^{o}}\] \[\left| \begin{align} & ~\text{The exterior angle of a triangle i equal to} \\ & \text{the um of it two interior oppoite angle} \\ \end{align} \right.\] \[\Rightarrow \] \[x={{120}^{o}}\] (v) \[x={{50}^{o}}+{{50}^{o}}\] \[\left| \begin{align} & \text{The exterior angle of a triangle i equal to} \\ & \text{the um of it two interior oppoite angle} \\ \end{align} \right.\] \[\Rightarrow \] \[x={{100}^{o}}\] (vi) \[x={{30}^{o}}+{{60}^{o}}\] \[\left| \begin{align} & \text{The exterior angle of a triangle i equal to} \\ & \text{the um of it two interior oppoite angle} \\ \end{align} \right.\] \[\Rightarrow \] \[x={{90}^{o}}\]
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