Q. hbisin poin
Terlampir 
Terlampir
[tex]\rm\angle{ABC}[/tex] = 180° - 130°
[tex]\rm\angle{ABC}[/tex] = 50°
.
[tex]\rm\angle{BCA}[/tex] = 180° - 110°
[tex]\rm\angle{BCA}[/tex] = 70°
.
[tex]\rm\angle{BAC}[/tex]
= 180° - [tex]\rm\angle{ABC}[/tex] - [tex]\rm\angle{BCA}[/tex]
= 180° - 50° - 70°
= 180° - 120°
= 60°
opsi D
Menentukan Sudut ABC
Sudut ABC + 130° = 180°
sudut ABC = 180 - 130°
Sudut ABC = 50°
________________
Menentukan Sudut BCA
Sudut BCA + 110° = 180°
Sudut BCA = 180° - 110°
Sudut BCA = 70°
________________
Menentukan Sudut BAC
Sudut ABC + Sudut BCA + Sudut BAC = 180°
50° + 70° + Sudut BAC = 180°
120° + Sudut BAC = 180°
Sudut BAC = 180° - 120°
Sudut BAC = 60° ( D)
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