jika panjang busur AB 24 cm, panjang busur CD cepat tolong!!!!!!

misal: keliling lingkaran = k, panjang busur = b

<AOB/360° = b/k
108°/360° = 24/k
3/10 = 24/k
3k = 240
k = 240/3
k = 80

panjang busur CD:
<COD/360° = b/k
72°/360° = b/80
1/5 = b/80
5b = 80
b = 80/5
b = 16

Jadi, panjang busur CD adalah 16 cm