Question 746563
scott wants to swim across a river that is 400 meters wide.
 He begins swimming perpendicular to the shore he started from but ends up 100 meters down river from where he started because of the current.
 How far did he actually swim from his starting point?
:
We can treat this as a right triangle problem where his route across the 
river is the hypotenuse (h), with legs of 400 and 100 meters
h = {{{sqrt(100^2+400^2)}}}
crunch it in you calc, you should get
h = 412.3 m swam from his starting point