Tolong yang nomor 11, tolong in please. mau dikumpulkan besok

Kelas 8 Matematika
Bab Lingkaran

Luas juring = 51 1/3
α/360° . π . r . r = 154/3
120°/360° . 22/7 . r² = 154/3
r² = (154/3) . (7 . 3 / 22)
r = √49
r = 7 cm

Panjang busur
= 2 . luas juring / r= (2 . 51 1/3) / 7
= 2 . 154/(3 . 7)
= 14 2/3 cm