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4√2=½a√3
8√2=a√3 /:√3
8√2/√3=a
a=8√6/3
a=2⅔√6
½a=1⅓√6
(1⅓√6)²+(4√2)²=x²
x²=10⅔+32
x²=42⅔
x=√42⅔-długość przeciwprostokątnej
Ob=4√2+1⅓√6+√42⅔