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sin60=5/x
√3÷2=5÷x
x=10÷√3
x=10√3/3cm
Teraz przyprostakatna:
ctg60=b/5
√3÷3=b/5
b=5√3/3cm
A na koniec obwod:
Ob=5√3+10√3+5
Ob=5(3√3+1)cm ← tu wyciagnelem przed nawias
Ob=(15√3 +5c)cm ← a tu normalnie