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Verified answer
<ABC = 180 - 143 = 37°<ACB = 180 - <BCA - <ABC
= 180 - 52 - 37
= 91° (A)
L ACB + L ABC + L CAB = 180 ( sudut segitiga berjumlah 180°)
L ACB + 37° + 52° = 180°
L.ACB + 89° = 180°
L ACB = 180° - 89°
L ACB = 91°