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H-wysokość
a-krawędź podstawy
α=45'
V=4/3
H=1/2a√2
V=1/3a²*H
4/3=1/3a²*1/2a√2 /*6
8=a²*a√2
a³√2=8
a√2=2
a=√2
H=1/2*√2*√2=1/2*2=1
a=√2
H=1