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.

1 Answer

answered Mar 14, 2018 by mdsamim (213,225 points)
selected Mar 15, 2018 by faiz

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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.

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