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V1 = a³ = 14cm × 14cm × 14cm = 2744cm³
d = 14cm r = 7cm H = 14cm π≈3,14
V2 = πr²H = 3,14 × 7² × 14 = 2154,04cm³
2744cm³ - 100%
2154,04cm³ - x
x = 2154,04cm³ × 100% ÷ 2744cm³ = 78,5%