tolong jawab nomor 65 dan 66

65.Luas = 2 x phi x r ( r + t)
Luas = 2 x 22/7 x 7 ( 7 + 18 )
Luas = 44(25) cm
Luas = 1.100 cm² (A)

66.Volume = phi x r² x t
Volume = 22/7 x 9 x 9 x 21 cm
Volume = 5.346 cm^3 (C).