Asked by Nathaniel

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?
Answered by bobpursley
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.
Answered by Nathaniel
How did you determine the angle?
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