tolong Bantu jawab dongss

Diketahui :
- Luas Permukaan Tabung = 2.992 dm²
- Jari - Jari = 14 dm

Ditanya : Tinggi = ....?

Penyelesaian :
- Tinggi :
L = 2 × π × r × (r + t)
2.992 = 2 × 22/7 × 14 × (14 + t)
2.992 = 2 × 22 × 2 × (14 + t)
2.992 = 44 × 2 × (14 + t)
2.992 = 88 × (14 + t)
2.992 = 1.232 + 88t
88t = 2.992 - 1.232
88t = 1.760
t = 1.760/88
t = 20 dm

Jawaban : C. 20 dm

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