tolong bantuan nyaaaaa
pakek caranya kak
pakek caranya kak
![](https://id-static.z-dn.net/files/d14/10c14614387de43a746146846b70b0db.jpg)
PEMBAHASAN
Sudut lurus = 180°
a + 128° = 180°
a = 180° - 128°
a = 52°
Sudut segitiga = 180°
72° + b + 52° = 180°
124° + b = 180°
b = 180° - 124°
b = 56°
semoga membantu
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