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9th Class Mathematics Coordinate Geometry Question Bank Co-ordinate Geometry

  • question_answer
    In the adjoining Diagram, PQ = ?

    A)  4 cm                           

    B)  2.5 cm 

    C)  2 cm                           

    D)  5 cm

    Correct Answer: B

    Solution :

    (b): \[OP=\frac{3}{2}\] \[OQ=2\] \[\therefore \]\[PQ=\sqrt{O{{P}^{2}}+O{{Q}^{2}}}\] \[=\sqrt{{{\left( \frac{3}{2} \right)}^{2}}+{{2}^{2}}}\] \[=\sqrt{\frac{9}{4}+4}\] \[=\sqrt{\frac{25}{4}}=\frac{5}{2}=2.5\] cm       


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