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4² + 6² = a²
16 + 36 = a²
a² = 52
a = √52
a = 2√13
α = połowa kata ostrego rombu
β = połowa kąta rozwartego rombu
sinα = 4/2√13 = 2/√13 = 2√13/13
sinβ = 6/2√13 = 3/√13 = 3√13/13