Areas related to Circles ncert solutions Chapter 12 Exercise 12.2 Question 12
12. To warn ships for underwater rocks, a lighthouse spreads a red colored light over a sector of angle to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use )
Lets suppose that lighthouse is at point O and it spreads light in the area shown in the diagram. Clearly, it is a sector.
Area of sector =