MathematicsFind the circumference of the inner and the outer circles, shown in the adjoining figure. (Take π=3.14)

Find the circumference of the inner and the outer circles, shown in the adjoining figure. (Take π=3.14)


  1. A
    56.52m, 119.32 m
  2. B
    66.52m, 119.32 m
  3. C
    56.52m, 129.32 m
  4. D
    66.52m, 129.32 m 

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    Solution:

    Concept: Given;
    Radius of outer circle = 19 cm
    Thickness= 10 m
    Thus the radius of the inner circle= Outer radius – thickness
    = 19-10
    = 9m
    Now we will apply the formula of circumference.
    Circumference of inner circle= {"mathml":"<math class="image_resized" style="width:192px;height:11px"><span style="font-family:Circumference of the outer circle{"mathml":"<math class="image_resized" style="width:228px;height:11px"><span style="font-family:Hence, the correct answer is option 1.
     
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