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To warn ships for underwater rocks, a lighthouse spreads a red coloured light over a sector of angle  to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use )

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It can be observed from the figure that the lighthouse spreads light across a sector of 80° in a circle of 16.5 km radius. Area of sector OACB =
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It can be observed from the figure that the lighthouse spreads light across a

sector of 80° in a circle of 16.5 km radius.

Area of sector OACB =

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