Tlg dibantu uahitu disurah cari”a”thx

5a – 40 + 3a + 20 + 2a = 180°
karena jumlah seluruh sudut segitiga = 180°

10a – 20 = 180°
10a = 180° + 20° = 200°
a = 200°/10 = 20°

semoga membantu 🙂

3a+20+5a-40+2a = 180°
10a-20 = 180°
10a = 180+20
10a = 200
a = 20°