• 2021 April(Z04) Math Question 59

    Trigonometry

    - Pythagorean Theorem & sin cos tan

    Sum of angles of a triangle, The law of sines & The law of cosines
    Choice B
    {240}{sin  (180∘−75∘−45∘)}={String}{sin  45∘}\frac\{240\}\{sin\; (180^\circ-75^\circ-45^\circ)\}=\frac\{String\}\{sin\; 45^\circ\}
    ∴String=240×{sin  45∘}{sin  60∘}=80{6}\therefore String = 240 \times \frac\{sin\; 45^\circ\}\{sin\; 60^\circ\}=80\sqrt\{6\}

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