MathematicsWhat is the area of the circular ring included between two concentric circles of radius 14 cm and 10.5 cm.

What is the area of the circular ring included between two concentric circles of radius 14 cm and 10.5 cm.


  1. A
     150 cm2
  2. B
    188cm2
  3. C
    248 cm2
  4. D
    269.5cm2 

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    Solution:

    Concept- Finding the area of circular ring by using the formula of area of circle
    Area of circle= πr2
    Given: radius = 14 cm, 10.5 cm
    Area of the bigger circle =  π 142
    = π×14×14
    =196π cm2
    Area of smaller circle ,  πr2
    =π 10.52
    =110. 25 cm2
    The shaded region,
    Area of circle = 196π – 110.25π 
    =85.75×227
    =269.5 cm2
    Hence, the correct option is 4.
     
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