Jika panjang busur AD 12,56 cm,Luas juring OBC......cm

Boom...

Panjang busur AD = 12,56 cm
60°/360° × 2π × r = 12,56
r = 12,56 × 6 / 2 × 3,14
r = 12 cm

Luas juring OBC
= 100°/360° × πr²
= 125,6 cm²