tolong bantu pake caranya

sudut AOB = 72 derajat
panjang busur AB =
[tex] \frac{72}{360} \times 2\pi \: r[/tex]
[tex] \frac{1}{5} \times 2 \times 3.14 \times 10 = 12.56 \: cm[/tex]

MAPEL = MATEMATIKA
KELAS = 8
BAB = SUDUT & LINGKARAN

diketahui =
jari jari = 10cm
sudut AOB = 72°

ditanya = panjang busur AB??

[tex] \frac{72}{360} = \frac{ab}{2 \times \pi \times r} \\ \frac{72}{360} = \frac{ab}{2 \times 3.14 \times 10} \\ \: \: \: \: \frac{1}{5} = \frac{ab}{62.8} \\ \: \: \: ab = \frac{62.8}{5} \\ \: \: \: ab = 12.56[/tex]

panjang busur AB = 12,56cm
semoga menjadi