# On a square handkerchief,ninecircular designs eacho radius7cm are made . find the area of the remaining portion of the handkerchief.

radius of circle=7cm (Given)

Diameter = 14 cm

side of square= sum of diameter of 3 circles

side=3 x 14=42

Area of square handkerchief = 42 x 42=1764 cm

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Area of one circle=$\mathrm{\pi}\times 7\times 7$ = 22/7 x 7 x 7

=22 x 7=154 cm

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area of 9 circle=9 x 154=1386 cm

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Therefore, Area of remaining portion = 1764-1386= 378 cm

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Regards

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