Answer:
100^2+400^2=c^2
10000+160000=c^2
170000=c^2
c=412.3
Explanation: You square root 170000 so c=412.3
412.3 Meters
Step-by-step explanation:
a= river width (400)
b= length traveled downstream (100)
c= total length (?)
160,000 + 10,000 =
= 170,000
=412.3
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