NCERT Solutions for Class 10 Science Chapter 12
Important NCERT Questions
Areas Related To Circles Class,
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 12.2
Page No:231
Questions No:12
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)
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The light house spreads red light in the form of sector of angle 80°, whose radius is 16.5 km.
Therefore, the area of sector
= 80°/360° × πr²
= 2/9 × π(16.5)²
= 2/9 × 3.14 × 16.5 × 16.5
= 189.97 km²