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sudut ABC = sudut DCB (sifat jika sebelah kiri dan kanannya sama)
sudut ACD = sudut DCB - sudut ACB = x - 1/3x = 2/3x
sifat segitiga (jumlah sudutnya 180 derajat)
1/3x+2/3x+2x=180⇔x+2x=180⇔3x=180⇔x=60 derajat
sudut BAC = 180 - (sudut ABC + sudut ACB)
= 180 - (x+1/3x)
= 180 - (60+20)
sudut BAC = 100 derajat