Four equal circles, each of radius 5cm, touch each other as showing fig.15.65. Find the area included between them.
Given,
Radius of each circle = 5cm
So,
Side of square = 10cm
Area of square = (10)2 = 100cm2
Area of each quadrant of circle with radius 5cm = 
Area of 4 quadrants = 
Area of remaining portion = 100-25π = 21.5cm2
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