SOLUTION
Step 1 :
In this question, we are meant to find the measure of < r.
We have that :
[tex]\begin{gathered} 90^{0\text{ }}+r+52^{0\text{ }}=180^0\text{ ( Sum of angles in a straight line )} \\ 142^{0\text{ }}+r=180^0 \\ r=180^{0\text{ }}-142^0 \\ r=38^{0\text{ }}\text{ ---OPTION B} \end{gathered}[/tex]
