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przyprostokatny a = 6 cm
b= 6cm + (6cm *2) = 18 cm
c = ?
6² + c² = 18²
36 + c² = 324
c² = 326-36
c² = 288
c = 12 pierwiastek z 2
Obwód = 6+18+12 pierwwiaski z 2= 24+ 12 pierwiastek z 2
x²=144-36=108
x=6√3
obwód=6+12+6√3=12+6√3