Question: The light from a rotating offshore beacon can illuminate effectively up to a distance of 250m. From a point on the shore that is 500m

The light from a rotating offshore beacon can illuminate effectively up to a distance of 250m. From a point on the shore that is 500m from the beacon, the sight line to the beacon makes an angle of 20 degree with the shoreline. What length of shoreline is effectively illuminated by the beacon?(i.e solve for the length of AD in the diagram below.)

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