linɡkaran yanɡ berpusat di o,∠AOB = 120°.diketahui panjanɡ OA = 12 cm panjanɡ busur AB adalah?

K = 2πr
K = 2 x 3,14 x 12
K = 75,36cm
Panjang busur AB = 120°/360° x 75,36
= ???

panjang busur =
[tex] \frac{sudut \: pusat}{360} \times 2\pi \: r[/tex]
[tex] = \frac{120}{360} \times 2 \times 3.14 \times 12 \\ = 25.12 \: cm[/tex]