A plane flying with a constant speed of 19 km/min passes over a ground radar station at an altitude of 7 km and climbs at an angle of 20 degrees. what rate, in km/min is the distance from the plane to the radar station increasing 1 minutes later? Your answer: kilometers per minute. Hint: The law of cosines for a triangle is = c a+b 2ab cos(0) - where is the angle between the sides of length a and b.