Diketahui volume tabung 2.156 cm³.jika tinggi tabung 14 cm ,tentukan luas permukaan tabung.
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Lp tabung → 2πr(r + t)
V tabung = πr²t
→ 2.156 = π × r² × 14
→ 2.156 = 22/7 × r² × 14
→ r² = 2.156 ÷ 44
→ r² = 49
→ r = √49
→ r = 7
[tex] \: [/tex]
Lp tabung
→ 2 × 22/7 × 7 × (7 + 14)
→ 2 × 22 × 21
→ 44 × 21
→ 924 cm²
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