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V=1/3Pp*H
Pp=a²
a=12dm
Pp=12²
Pp=144dm²
d=a√2
d=12√2
1/2d=6√2
(6√2)²+H²=10²
72+H²=100
H²=28
H=2√7dm
V=1/3*144*2√7
V=96√7dm³
Objętość tego ostrosłupa wynosi 96√7dm³