9th Class Mathematics Constructions Question Bank Constructions

  • question_answer
    Let ABC be a triangle in which BC = 5 cm, \[\angle B={{60}^{o}}\]and AC + AB = 7.5 cm. Given below are the steps of constructing the triangle ABC. Which of the following steps is INCORRECT?
    Step I: Draw a line segment BC of length 5 cm.
    Step II: Draw an \[\angle XBC={{60}^{o}}\]at point B of line segment BC.
    Step III: Cut off PB = 3.5 cm on the ray BX.
    Step IV: Join PC.
    Step V: Draw\[\bot \]bisector of BC which intersect ray BX at A. Join AC.
    Step VI: ABC is the required triangle.

    A)  Step II only

    B)  Step III only

    C)  Step II and V

    D)  Step III and V

    Correct Answer: D


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