Answer:
x = 48
Step-by-step explanation:
The two angles shown in the diagram are supplementary and add to 180° because they form a straight line. We can set up an equation:
x - 12 + 3x = 180
4x - 12 = 180
4x = 192
[tex]x=42[/tex] ✔︎
∠1= 3x=3×42=126°
∠2=x-12=42-12= 30°
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