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5x - krawędź boczna
40=x*x*5x
40=5x³/5
x³=40:5
x³=8/³√
x=2--->krawędź podstawy
5x=5*2=10--->krawędź boczna
b=5*a
a=?
V=a²*b
40=a²*5a
40=5a³
a³=40:5
a³=8
a=∛8
a=2
b=5*a
b=5*2
b=10