Question 881831: A boy walks 7 km west,then 4 km north,and finally 4 km east.How far is he from his starting point?
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! he travels west 7 km then north 4km the n east 4 km.
if he started at the coordinate point of (0,0), then his travels would take him to:
(-7,0) when he goes west.
(-7,4) when he goes north.
(-3,4) when he goes east.
he started at (0,0) and ended at (-3,4)
the distance between (0,0) and (-3,4) is equal to:
sqrt((4-0)^2 + (-3-0)^2) which is equal to:
sqrt(4^2 + (-3)^2) which is equal to:
sqrt(16 + 9) which is equal to:
sqrt(25) which is equal to 5.
|
|
|
