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
)
Solution:
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 =
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