Bantu yaaa tolong cepet hehehhe

18. phi x r² x t = volume
22/7 x 5 x 5 x t = 1100
550/7 x t = 1100
t = 1100 x 7/550
t = 14

19. luas sisi tabung= 2 x phi x r x (r+t)
2 x 22/7 x 6 x (6+8)=
44/7 x 6 x 14 = 44 x 12 = 528 cm²

20. volume kerucut= 1/3 x 3,14 x r² x t
1/3 x 3,14 x 10 x 10 x 15=
314 x 5 = 1570 cm³

semoga membantu
follow aku jika ingin bertanya mtk^_^