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180 = 64 + C + 90
180 = 154 + C
C = 26
.
sdut BCD = sdut B + sdut C + sdut D
180 = 35 + C + 90
180 = 125 + C
C = 55
jadi besar sdut ACB = 26 + 55 = 81
∠ACB + 64° + 35° = 180°
∠ACB + 99° = 180°
∠ACB = 180° - 99°
∠ACB = 81°
Berarti jawabannya D. 81