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P = 12,5
α = 30°
a = ? - bok rombu
1. Obliczam bok rombu
P = 12,5[j²]
P = a²*sin α
a²*sin α = 12,5 [j²]
a²*sin 30° = 12,5[j²]
a²*1/2 = 12,5 [j²] /*2
a² = 25 [j²]
a = √25
a = 5 [j]