Circumference of a circle-A is 11/7 times perimeter of a square. Area of the square is 784 sq cm. What is the area of another circle-B whose diameter is half the radius of the circle-A ?

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Circumference of a circle-A is 11/7 times perimeter of a square. Area of the square is 784 sq cm. What is the area of another circle-B whose diameter is half the radius of the circle-A ?