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¹/₃h = 1
¹/₃ * √3/2 a = ¹/₃ * 1
1√3/6a = ⅓ /*6
1√3a = 2
a = ²/√₃ = 2√3/3
2) 50% * 12 = 6 (dł. drugiej przekątnej)
a²(bok rombu - liczymy z pitagorasa) = 6² + 3² = 36 + 9 = 45
a = √45 = 3√5