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the diameter of two circle are …

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the diameter of two circle are in the ratio 3:2find the ratio of their areas find the area of the circle whose circumference is 77cm

    • Posted by Shahista Anjum 7 years, 2 months ago

    CBSE > Class 07 > Mathematics
    • 1 answers

    M Sarkar 6 years, 8 months ago

    Q.the diameter of two circle are in the ratio 3:2find the ratio of their areas

    Ans. Let's say dia of both circle is  3x and 2x

    Then the radius will be 1.5x and x

    and area will be pie (1.5x)2 and pie (x)2

    And their ratio will be=  pie (1.5x)2  /  pie (x)2  

                                             = 1.5 /1 =1.5

    Q.find the area of the circle whose circumference is 77cm

    Ans. Circumference = 2 pie R =77 cm 

                                             R = 77 /(2 *3.14) =12.26 , so radius  is 12.26 cm

                                Area  =  Pie R2 = Pie * (12.26 )2 

                                       Area = 3.14 * (12.26 )2 = 471.965 cm2

    0Thank You

    ANSWER
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