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----------- kreska ułamkowa
4
P= 12² √3
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4
P= 144 √3
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4
P= 144*1,73
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4
P= 249,12
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4
P= 62,28 m
P= ¼×a²√3
a=12m
P=¼×12²√3= ¼×144√3= 36√3m≈61,2m
h≈10.392
1/2*12*10.392≈5.196*12≈62.352m²