Question -
Answer -
Find the area of the sea over which the ships are warned.
(Use π = 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 (θ) = 80°
Now, the total area of the sea over which theships are warned = Area made by the sector
Or, Area of sector = (θ/360°)×πr2
= (80°/360°)×πr2 km2
= 189.97 km2