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8th Class Mathematics Practical Geometry Question Bank Geometry

  • question_answer
    In the given figure, \[{{60}^{o}}\] is inscribed in a circle with centre O. If \[\angle CAD={{40}^{o}}\], find \[\angle BDC={{25}^{o}}\].

    A)  \[\angle BDC\]                 

    B)  \[{{85}^{o}}\]

    C) Cannot be determined

    D) None of these

    Correct Answer: A

    Solution :

    Angle in a semicircle is a right angle. So,  \[{{108}^{o}}=\angle ABC+{{56}^{o}}\] In\[\Rightarrow \] \[\angle ABC={{108}^{o}}-{{56}^{o}}={{52}^{o}}.\] \[(n\ge ,3)\] \[\left( \frac{2n-4}{n} \right)\]


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