Answer :

Radius of circle is 7 cm.

Diameter of the circle is 14 cm.

As 3 circles are there on one side of the square.

The side of the square will be 14 × 3 = 42 cm

Area of square = (Side)^{2}

= (42)^{2}

= 1764 cm^{2}

Area of each circle = π*r*^{2}

= × (7)^{2}

= 154 cm^{2}

Area of 9 circles = 9 × 154

= 1386 cm^{2}

Area of the remaining portion of the handkerchief = 1764 - 1386

**= 378 cm ^{2}**

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