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3x + 6x + 90 = 180
9x = 180 - 90
9x = 90
x = 10⁰
No 2
5 + 6 + 7 = 18
Sudut A = 5/18 x 180⁰
= 50⁰
Sudut B = 6/18 x 180⁰
= 60⁰
Sudut C = cari sendiri ya kan gampang