Areas related to Circles ncert solutions Chapter 12 Exercise 12.3 Question 11
11. On a square handerchief, nine circular designs each of radius 7 cm are made. Find the area of the remaining portion of the handerchief.
Area of Remaining portion=Area of square-area of 9 circles (1)
Side of square= sum of diameters of three adjacent circles=14+14+14=42 cm
Area of square= side x side=42 x 42=1764 (2)
Area of 9 circles (3)
Putting (2) and (3) in (1), we get
Area of Remaining portion=1764-1386=378