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5x=55
x=11
11 . 3= 33
Sudut A dalam= 55°
Sudut B= 2x
Sudut C= 3x
x= 55°+2×+3×=180
55°+5x=180
5×=180-55°
5x= 125
×= 125/5
×= 25
Sudut C= 3xj
= 3x25=75
Jadi jawabannya adalah c.75°