Tolong dijawab menggunakan cara ^^

semoga membanti yaaa

3.) 3x° + 2x° = 180°
5x° = 180°
x = 180°/5 = 36° (B)

4.) dik, AC= 45cm
AB:BC = 7:2
dit, AB=...?
Jawab:
AB:BC = 7:2 = 7+2 = 9
AB= 7/9 × 45cm
= 35cm (C)

semoga membantu:)
maaf kalo salah