Areas related to Circles ncert solutions Chapter 12 Exercise 12.3 Question 14
14. AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm with center O. If , find the area of the shaded region.
Area of shaded region = Area of sector OAB- Area of sector OCD (1)
Area of sector OAB
Area of sector OCD
Putting (2) and (3) in (1), we get
Area of shaded region