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H = 5 cm
P = ⅘5 × ¼ (a²√3)
P = 5 × ¼ (5²√3)
P = 5 × ¼ (25√3)
P = 5 × 6,25√3
P = 31,25√3 cm²
V = ¼ a²√3 × H
V = ¼ 5²√3 × 5
V = ¼ 125√3
V = 31,25√3 cm³