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Question

In the given figure, four equal circles are described about the four corners of a square so that each circle touches two of the circle as shown in the figure. find the area of the shaded region, each side of the square measuring 14 cm.

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Solution

Area of each of the four quadrants is equal to each other with radius 7 cm.

Area of the square ABCD = (Side)2 = (14 cm)2 = 196 cm2
Sum of the areas of the four quadrants = 4×14×227×7×7 cm2
= 154 cm2
∴ Area of the shaded portion = Area of square ABCD - Areas of the four quadrants
= (196 - 154) cm2
= 42 cm2

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