You can use a theorem to solve this [I Love Math]

A girl moves 4km towards East. Then moves 3km towards North. How far she is from the starting point.

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SW-User

https://www.google.com/search?q=pythagorean+theorem&oq=pythagorian+&aqs=chrome.1.69i57j0i10l6.18317j0j1&sourceid=chrome&ie=UTF-8