[tex]a).besar \: < AOB \\ < BOD - < AOD \\ 180° - 80° \\ 100° \\ \\ b).besar \: < ACB \\ \frac{1}{2} \times < AOB \\ \frac{1}{2} \times 100° \\ 50°[/tex]
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[tex]a).besar \: < AOB \\ < BOD - < AOD \\ 180° - 80° \\ 100° \\ \\ b).besar \: < ACB \\ \frac{1}{2} \times < AOB \\ \frac{1}{2} \times 100° \\ 50°[/tex]