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V = 45m³
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V = 1/3 × Pp × h
45 = 1/3 × 54 × h | : 1/3
45 : 1/3 = 54 × h
135 = 54 × h | : 54
h = 135 : 54
h = 2,5
Odp. Wysokość kopca wynosi 2,5m