a rescue helicopter has flown from its home base to an emergency scene 48 miles away on a heading of 351 degrees. It then takes off for the nearest hospital 39 miles away on a heading of 78 degrees. Since this is an emergency vehicle, the pilot must keep the helicopter at a specific fuel level at all times. If he flies too far he will need to fill up first. Since this is a different hospital from where he needs to know the distance back to home base