A joint search and rescue effort has been
carried out by the United States and Puerto Rico to find a missing ship
in the Bermuda Triangle area. The missing ship was last heard at location
A as indicated in the map. A rescue ship noted the ship was 78 miles
north and 90 miles east from its current position (indicated by point
O in the map). For ease of navigating the ship, the captain requested
the navigation officer to give the position in terms of the polar coordinates.