The area of a circle whose radius is the diagonal of a square whose area is 4 is.
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side of square = √area = √4 = 2 units
The diagonal of square is given by - √2×a [ here a is side of square]
diagonal of square = 2×√2 = 2√2
Area of circle = πr² = 3.14×2√2 = 6.28√2 unit²
Answer - Area of the circle is 6.28√2 unit².