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a - krawędź czworościanu = ?
h = a√3/2
2h = a√3
a = 2h/√3 = 2 * 18√3/√3 = 36
P - pole powierzchni całkowitej = a²√3 = 36²√3 = 1296√3
V - objętość czworościanu = a³√2/12 = 46656√2/12 = 11664√2/3 = 3888√2