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V=Pp * h
320 cm³ : 10cm = 32 cm²
Pp=32cm²
Pp=a*h/2
Pp=a*a/2
Pp=a²/2
32cm²=a²/2 /*2
64cm²=a²
a=8cm
8²+8²=b²
64+64=b²
128=b²
b=8√2
boki trójkąta : przyprostokątne 8cm przeciwprostokątna 8√2cm.