Tolong dijawab menggunakan caranya yang jelas dan benar

A.
4a° + 60° + 2a° = 180°
6a° = 180° – 60°
6a° = 120°
a = 120° ÷ 6°
a = 20°

b.
54° + 96° + 90° + 5b° = 360°
240° + 5b° = 360°
5b° = 360° – 240°
b = 120° ÷ 5°
b = 24°

5b = 24 × 5 = 120°

semoga membantu ^^