Four equal circles each of radius ‘a’ units touch one

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Four equal circles each of radius ‘a’ units touch one another. The area enclosed between them (π = 22/7 ), in square units, is

1. 3a²
2. 6a²
  7
3. 41a²
  7
4. a²
  7

Correct Option: B

Using Rule 10 and 14,
Area of shaded part

= Area of square – Area of circle

= (2a)² - πr² = 4a² -	22	a²
	7

⇒	28a² - 22a²	=	6a²
	7		7