Answer: Option D
 -    Area of square = 2cm2
  Side of square = square root of 2
  Let r be the radius of the circle and adjust it like that it forms a right angle triangle then
  r2 = (square root of 2)2 + (square root of 2 / 2)2
  r2 = 2 + ( 2 / 4)
  r2 = 5 / 2
  r = square root of ( 5 / 2)
  In a full square the diagonal of square will be the diameter of the cirlcle.
  r = square root of ( 5 / 2) is this so diameter = 2 x square root of (5 / 2)
  Diagonal of square = side x square root of 2
  side x square root of 2 = 2 x square root of 5 / square root of 2
  side x 2 = 2 x square root of 5
  side = square root of 5
  Area of square = r2
  = (square root of 5)2
  = 5 cm2