9th Class Mathematics Triangles Question Bank Triangles

  • question_answer
    In the given figure,\[AP\bot QR,PR>PQ\] and \[PS=PQ.\] Then

    A)  AP = QP                     

    B)         AP > AQ        

    C)        \[\angle APS>\angle APQ\]         

    D)         AR>AQ          

    Correct Answer: D

    Solution :

    In\[\Delta APQ\] and\[\Delta APS,\] we have \[PQ=PS\]                                            [Given] \[AP=AP\]                                       [Common] \[\angle APQ=\angle APS\]                                      [Each\[{{90}^{o}}\]] \[\therefore \]\[\Delta \Alpha PQ=\Delta APS\]        [By SAS congruency] \[\therefore \]\[\angle AQP=\angle ASP\]                [By C.P.C.T.] or \[\angle AQS=\angle ASQ\]                              ?(1) But, \[\angle ASQ>\angle ARS\] \[\therefore \]\[\angle AQS>\angle ARS\]                [From (1)] \[\Rightarrow \]\[\angle AQR>\angle ARQ\] \[\therefore \] \[AR>AQ.\] [Side opposite to greater angle is longer]


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