10th Class Mathematics Introduction to Trigonometry Question Bank Introduction to Trigonometery

  • question_answer
    In \[\Delta ABC\], if\[\angle \text{B}=\text{9}0{}^\circ ,\text{AB}=\text{5 cm}\] and AC =10 cm, find\[\angle A\]and\[\angle C\]

    A)  \[~\text{9}0{}^\circ ,\text{ 45}{}^\circ \]              

    B)  \[\text{6}0{}^\circ ,\text{ 3}0{}^\circ \]

    C)  \[\text{45}{}^\circ ,\text{ }0{}^\circ \]                   

    D)  \[~\text{9}0{}^\circ ,\text{ 6}0{}^\circ \]

    Correct Answer: B

    Solution :

     In \[\text{1173}0=\text{2}\times \text{3}\times \text{5}\times \text{17}\times \text{23}\]AB = 5 cm, AC = 10 cm Now, in right angled \[\therefore \] \[=\text{17}\times \text{23}=\text{391}\] \[=\text{2}\times \text{3}\times {{\text{5}}^{\text{2}}}\times \text{7}\times \text{l7}\times \text{23}=\text{41}0\text{55}0\]\[\pi \] \[\frac{22}{7}\]\[\frac{22}{7}\] \[\pi \] \[\text{4}0={{\text{2}}^{\text{3}}}\times \text{5}\]


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