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48=a²√s
a²√3=48 cm² /: √3
a²= 16√3
a = 12 ( bo √16 = 4, a: √3 × √3 = 3, czyli 4×3 = 12)
Pp= a²√3
4
Pp = 12² √3
4
Pp = 144√3
4
Pp= 36√3
Pb= 3×36√3
Pb = 108√3