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a=6cm
b=2a=2×6=12cm
c²=a²+b²
c²=6²+12²
c²=36+144
c²=180
c=√180
c=6√5cm
obwód=a+b+c=6+12+6√5=18+6√5=6(3+√5)cm
wersja 2:
a=6cm
c=2a=12cm
b²=c²-a²
b²=12²-6²
b²=144-36
b²=108
b=√108
b=6√3cm
obwód=a+b+c=6+12+6√3=18+6√3=6(3+√3)cm