Answer:
• x+3x=180°
,• x=45°
,• 3x=135°
Explanation:
From the diagram
3x and x are on a straight line, they are therefore supplementary.
[tex]3x+x=180^0[/tex]We solve the equation above for x.
[tex]\begin{gathered} 4x=180^0 \\ x=\frac{180}{4} \\ x=45^0 \end{gathered}[/tex]Therefore:
[tex]3x=3\times45=135^0[/tex]