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p=ah
v=a²h
18=ah
8=a²h
h=18/a
8=a²×18/a
8=18a
a=8:18
a=⁴/₉cm
h=18:⁴/₉=40,5cm
d podstawy=a√2=⁴/₉√2cm
D bryły=√(⁴/₉√2)²+40,5²=√³²/₈₁+1640,25=√531569/324=¹/₁₈√531569cm