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a²=16
a=√16=4cm --->kraw,podstawy
przekatna bryly D=9cm
to przekatna podstawy d=a√2=4√2 cm
z pitagorasa
(4√2)²+H²=9²
32+H²=81
H²=81-32
H=√49=7 cm --->wysokosc bryly
V=Pp·H=16·7=112cm³