10th Class Mathematics Coordinate Geometry Question Bank Co-ordinate Geometry

  • question_answer For what value of 'm' are the points (5,5), (m, 7) and (8,8) collinear?

    A)  6                                            

    B)  7

    C)  8                            

    D)         5

    Correct Answer: B

    Solution :

     The given points are collinear if the area of the triangle formed by the points is 0. \[QA\bot AB\] \[\text{PB}\bot \text{AB}\] \[\Delta \text{QAO}=\text{245 c}{{\text{m}}^{\text{2}}}\] \[\Delta \text{QAO}\] \[\Delta \text{PBO}\] \[\angle \text{QAO}=\angle \text{BPO},\text{ }\angle \text{AQO}=\angle \text{PBO}\]

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