nomor terakhir tolong dijawab pke cara, bentar lagi dikoreksi

kll = 66 cm
diameter = 66 : 22/7 = 66 x 7/22 = 21cm
r = 21 : 2 = 10,5cm
Luas = 3,14 x 10,5 x 10,5
= 346.185 cm²