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a²=H²+(⅔h)²
H²+(a√3/3)²=a²
H²=a²-a²/3
H=√6/3 a
v=⅓Pp H
v=⅓a²√3;4×√6/3 a
v=a³√18/36
v=a³√9×2/36
v=3a³√2/36
v=a³√2/12
pole=4×a²√3:4=a²√3