Tolong dijawab Pake Cara ya Kak….Jangan Asal.​

Penjelasan dengan langkah-langkah:

<CPB = 1/2 (<COB – <DOA)

15° = 1/2 (<COB – 20°)

2 × 15° = <COB – 20°

30° = <COB – 20°

<COB = 30° + 20°

<COB = 50°