Answer:
[tex]x=80[/tex]°
Step-by-step explanation:
[tex]sum ~of ~3~angles ~of ~a~ triangle ~is ~180[/tex]
[tex]80+20+x=180[/tex]
[tex]x=missing ~angle[/tex]
[tex]100+x=180[/tex]
[tex]x=180-100=80[/tex]
[tex]So, x=80[/tex]
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hope it helps...
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