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6x + 30" = 180"
x = 25"
30 + a + 2x + 30 = 180"
30 + a + 50 + 30 = 180"
a + 110 = 180"
a = 70"
60 + 2x = 180
2x=120
x=60
jadi
30 + (2(30) + 30) + a = 180
30+(60+30)+a=180
30 + 90 + a= 180
120 + a = 180
a=180-120
=60 derajat
buktinya kalo hasilnya bener, kita tambahin semua sudutnya dan bakal dapet 180.
30 + 90 + 60 = 180
smg membantu