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From the figure, we observe that,
All the horizontal lines are parallel to each other.
Hence,
[tex]h=g=90^{\circ}[/tex]Using the linear pair,
[tex]\begin{gathered} i+h=180^{\circ} \\ i+90^{\circ}=180^{\circ} \\ i=90^{\circ} \end{gathered}[/tex]Hence, the answers are,
[tex]\begin{gathered} i=90^{\circ} \\ g=90^{\circ} \\ h=90^{\circ} \end{gathered}[/tex]