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b - krawędź boczna = 6 cm
h - wysokość podstawy = a√3/2 = 4√3/2 = 2√3 cm
2/3 * h = 2/3 * 2√3 cm = 4√3/3 cm
H - wysokość ostrosłupa = √[b² - (2/3h)²] = √[6² - (4√3/3)²] = √(36 - 16/3) =
= √(36 * 3 - 16)/3 = √(108 - 16)/3 = √92/3 = (√92 * 3)/3 = (√276)/3 = 2√69/3 =
= ≈5,54 cm