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Answer 1 · 2017-04-11T12:09:49

#"displacement="1000" "km#
#alpha=36.87^o#

enter image source here

#O A=displacement=sqrt(800^2+600^2)#

#O A=displacement=sqrt(640000+360000)#

#O A=displacement=sqrt(1000000)#

#O A=1000 " "km#

#tan alpha=600/800=3/4#

#alpha=36.87^o#