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π = 22/7
Ka = π × d
= 22/7 × 28 cm
= 22 × 4 cm
= 88 cm
r = d : 2
= 28 cm : 2
= 14 cm
La = π × r²
= 22/7 × 14²
= 22/7 × 196
= 22 × 28
= 616 cm²
LP = 2.992 cm²
LP = 2(La) + (Ka × t)
2.992 = 2(616) + (88 × t)
2.992 = 1.232 + 88t
88t = 2.992 - 1.232
88t = 1760
t = 20
Jadi tinggi tabung tersebut adalah 20 cm.