Question -
Answer -
Find the area of the sea over which the ships are warned.
(Use ╧А = 3.14)
Solution:
Let O bet the position of Lighthouse.
Here the radius will be the distance overwhich light spreads.
Given, radius (r) = 16.5 km
Sector angle (╬╕) = 80┬░
Now, the total area of the sea over which theships are warned = Area made by the sector
Or, Area of sector = (╬╕/360┬░)├Ч╧Аr2
= (80┬░/360┬░)├Ч╧Аr2┬аkm2
= 189.97 km2