Penjelasan dengan langkah-langkah:
<O = 71°
<P = siku² = 90°
maka
X = 180°-71°-90°
X = 180°-161°
X = B. 19°
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Penjelasan dengan langkah-langkah:
<O = 71°
<P = siku² = 90°
maka
X = 180°-71°-90°
X = 180°-161°
X = B. 19°