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b=10cm
z tw.Pitagorasa
H²+a²=b²
H²+4²=10²
H²+16=100
H²=100-16
H²=84
H=2√21 wysokość ostrosłupa
V=⅓PpH
Pp=6*a²√3/4
Pp=3*4²√3/2
Pp=3*16√3/2
Pp=3*8√3
Pp=24√3cm²
V=⅓*24√3*2√21=16√63=48√7cm³