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d₁²=3²+5⁵ z tw. Pitagorasa
d₁²=36
d₁²=6
x- trzecia krawędź prostopadłościanu
d₁²+x²=8² z tw. Pitagorasa
x²=64-36
x²=28
x=√28
x=2√7
Pp=2*5*2√7+2*3*5+2*3*2√7
Pp=20√7+30+12√7
Pp=32√7+30