Tolong bantu jawab soal no 10 dong

Bab Lingkaran

Cari panjang OA dulu
OA^2 = AB^2 + OB^2
OA^2 = 9^2 + 12^2
OA^2 = 81 + 144
OA = √255
OA = 15 cm

AC = OA - OC
AC = 15 cm - 9 cm
AC = 6 cm