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84 = 6a² / :6
14 = a²
a = √14cm
V = a³
V = (√14)³
V = 196cm³
suma krawędzi - 12a
12 × √14 = 12√14
a²=14
a=√14
V=√14×√14×√14=14√14cm³
krawedzie 12
12×√14