Multiple Choice Questions on What is the radius of the circle whose area is equal to the sum of the areas of two circles whose ra........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

What is the radius of the circle whose area is equal to the sum of the areas of two circles whose ra...........

Quantitative Aptitude ( CCS) Mensuration 2D
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    What is the radius of the circle whose area is equal to the sum of the areas of two circles whose radii are 20 cm and 21 cm?

    27cm

    Incorrect Answer

    28cm

    Incorrect Answer

    29cm

    Correct Answer

    25cm

    Incorrect Answer
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    Explanation:

    Answer & Explanation
    Answer – C. 29cm
    Explanation :
    πR² = πr1² + πr2²
    πR² = π(r1² + r2²)
    R² = (400 + 441)
    R = 29 cm

    By: MIRZA SADDAM HUSSAIN
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    Sushank Saini

    in question unit used is cm but in answer it is metres

    0 0 reply
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