Question

To warn ships for underwater rocks, a lighthouse
spreads a red coloured 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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Answer 1

Answer:

When a lighthouse spreads a red-colored light underwater, it forms a sector of angle 80o and radius =16.5km

∴ Area of sector =360θ×π×r2

∴ Area of sector =36080×3.14×16.5×16.5

                            =189.97km2

Answer 2

Answer:

this is the correct answer