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

  • question_answer
    What is the area of the triangle formed by the mid-points of the sides of\[\Delta \mathbf{ABC}\]. With coordinate A (3, 2), B(-5, 6) and C (8,3).                                         

    A)  7 sq. units                    

    B)  14 sq. units       

    C)  2.5 sq. units                 

    D)  5 sq. units   

    Correct Answer: B

    Solution :

    (b): \[\frac{1}{2}\left| 3\left( 6-3 \right)+-5\left( 3-2 \right)+8\left( 2-6 \right) \right|\] \[=\frac{1}{2}\left| -28 \right|=14\]sq.umts


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