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JEE Main & Advanced Mathematics Trigonometric Equations Question Bank Relation between sides and angles, Solutions of triangles

  • question_answer
    If the sides of triangle be 6, 10 and 14 then the triangle is [MP PET 1982]

    A) Obtuse angled

    B) Acute angled

    C) Right angled

    D) Equilateral

    Correct Answer: A

    Solution :

    \[\cos \theta =\frac{36+100-{{(14)}^{2}}}{2.6.10}\Rightarrow \theta ={{120}^{o}}\].


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