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    Four circle having equal radii are drawn with centres at the four corners of a square. Each circle touches the other two adjacent circles. If the remaining area of the square is 168 cm2, what is the size of the radius of the circle?(in cm)

  • 14
  • 1.4
  • 35
  • 21
  • 3.5
  • Explanation:

    Area of shaded region = (4-∏)r2

    ∴ (4-∏)r= 168

    r= 168÷4-22/7

    r= 168/6×7

    r= 28×7

    r=√196=14 cm

     


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