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besar sudut C = 180 - 145 = 35
dalam satu lingkaran = 180 derajat
2x + 3x+ 35 = 180
5x = 180 - 35 =145
x = 145 : 5 = 29
besar sudut ABC = 3X
= 3 (29)
=87 derajat . Jawabannya D