A ship is first seen on a radar screen to be 9 km east of the radar site. Some time later, the ship is 18 km northwest. What is the displacement of the ship from the first location it is seen at?

Question

A ship is first seen on a radar screen to be 9 km east of the radar site.  Some time later, the ship is 18 km northwest.  What is the displacement of the ship from the first location it is seen at?

bobpursley · Answer

http://www.jiskha.com/display.cgi?id=1478363831 sideA=18 sideB=9 AngleC=135 degrees c^2=a^2+b^2-2abcosC solve for c.

Nathaniel · Answer

How did you determine the angle?