Multiple Choice Questions on Area of a right angled triangle is 30cm2 If height 7 m more then base then find the length ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

Area of a right angled triangle is 30cm2 If height 7 m more then base then find the length ........

Quantitative Aptitude (RRB NTPC) Mensuration 3D
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    Area of a right angled triangle is 30cm2. If height 7 m more then base then find the length

    5 m

    Correct Answer

    12 m

    Incorrect Answer

    7 m

    Incorrect Answer

    9 m

    Incorrect Answer
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    Explanation:

    Let the length of the base be x
    Height of the triangle = x+7
    Area of triangle = ½ × x × (x + 7) = 30
    x2 + 7x – 60 = 0
    x2 + 12x – 5x – 60 = 0
    (x+12)(x-5) = 0
    X= 5 = length of base

    By: Barka Mirza
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