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Asked: 2021-08-02T21:27:21+05:30 In:

To warn ships for underwater rocks, a lighthouse spreads a red colored light over a sector of angle 80° to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use π = 3.14). Q.12

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Give me the best solution of the ncert class 10 question of chapter areas related to circles . Find the solution of exercise 12.2 question no. 12 and also give me the simplest solution of this question.To warn ships for underwater rocks, a lighthouse spreads a red colored light over a sector of angle 80° to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use π = 3.14).

areas related to circles ncertbest math ncert solutionexercise 12.2 ncertncert class 10th solution
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    1. Guru

      Let O bet the position of Lighthouse.

      Ncert solution class 10 chapter 12-9

      Here the radius will be the distance over which light spreads.

      Given, radius (r) = 16.5 km

      Sector angle (θ) = 80°

      Now, the total area of the sea over which the ships are warned = Area made by the sector

      Or, Area of sector = (θ/360°)×πr2

      = (80°/360°)×πr2 km2

      = 189.97 km2

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