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7th Class Mathematics The Triangle and its Properties Question Bank Geometry

  • question_answer
    The perimeter of a rectangle whose one side measure 20 m and the diagonal is 29 m

    A) 82 m               

    B) 78 cm

    C) 98 m                           

    D) 88 m

    Correct Answer: A

    Solution :

        In rectangle \[{{l}^{2}}+{{b}^{2}}={{d}^{2}}\] \[{{b}^{2}}={{d}^{2}}-{{l}^{2}}={{(29)}^{2}}-{{(20)}^{2}}\] \[=841-400=441\] \[b=21\,m\] Perimeter = 2(20 + 21) m = 82 m    


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