Four equal circles, each of radius 5 cm, touch each other as shown in the figure. Find the area included between them. (Take π = 3.14)
Required area = Area of square ABCD – Area of 4 quadrants
= (10 cm × 10 cm) – 4 × 1/4πr^{2}
= 100 – 4 × ¼ × 3.14 × 5 × 5
= 100 – 3.14 × 25
= 21.5 cm^{2}