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Answer: Option A
:
A
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A
Approach 1: With the use of given figure. We can find out Option(a) is right answer. 
Shortcut: From the 4 - π approach, each of the shaded region will be 10% of the square's area. Hence, the required area = 40% of 1= 0.4. Look in the answer options for this value. Only option(a) comes the closest. All answer options are far apart.
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