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R = 4
R = ⅔h
4 = ⅔h | :⅔ (czyli pomnożyć przez trzy drugie)
4 * 3/2 = h
h = 12/2
h = 6
h = a√3 / 2
6 = a√3 / 2 | * 2
12 = a√3 | * √3
12√3 = 3a | :3
4√3 = a