Penjelasan dengan langkah-langkah:
<ACB + 50 + 50 = 180
<ACB + 100 = 180
<ACB = 180 - 100
<ACB = 80°
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Penjelasan dengan langkah-langkah:
<ACB + 50 + 50 = 180
<ACB + 100 = 180
<ACB = 180 - 100
<ACB = 80°