We have the following:
when two angles are complementary, the sum of these is equal to 90 degrees, therefore
[tex]\begin{gathered} <1+<2=90 \\ <1=83 \end{gathered}[/tex]
solving for <2
[tex]\begin{gathered} 83+<2=90 \\ <2=90-83 \\ <2=7 \end{gathered}[/tex]
That is, <2 is equal to 7 °
