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P=1/2absinα α to kąt między bokami a i b
90= 1/2 · 18√3·10 ·sinα
90= 90√3 ·sinα /:90√3
90/90√3 =sinα
sinα= 1/√3 ·√3/√3
sinα =√3/3
sinα≈0,5773
α≈35°
Odp. Miara szukanego wynosi około 35° (sinα =√3/3).