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Question

Four equal circles are described about the four corners of a square so that each touches two of the others, as shown in the figure. Find the area of the shaded region, if each side of the square measures 14 cm.

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Solution

Side of the square = 14 cm
Radius of the circle =142= 7 cm
Area of the quadrant of one circle = 14πr2
=14×227×7×7=38.5 cm2
Area of the quadrants of four circles = 38.5×4=154 cm2

Now,
Area of the square = Side2
=142=196 cm2

Area of the shaded region = Area of the square - Area of the quadrants of four circles
= 196 - 154
= 42 cm2

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