a man goes 30 km due to North and then 40 km due to how far away is he from his initial position
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North = 30km
I
I
I------------ East = 40
distance from his initial position = sq.root of 40^2 + 30^2
= sq.root of 1600 + 900
= sq.root of 2500
= sq.root of 25 x 100
= 5 x 10
=50 km.
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