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A surveyor measures the distance across a straight river by the following method: Starting directly across from a tree on the opposite bank, she walks 100 m along the riverbank to establish a baseline. Then she sights across to the tree. The angle from her baseline to the tree is 35.0°. How wide is the river?

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WTH ,You copy+paste !!!
Show your work :P

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Other answers:

I will kill myself if I'm ever asked to do this mentally... or maybe I'll kill the instructor :P JK
@Eyad Sir Sir Vector is among the weakest chapter of mine
@terenzreignz will do it ?
Who needs vectors? |dw:1367154306851:dw|
Use Trig .
The surveyor starts here...|dw:1367154405038:dw|
Moves 100 metres.... So that the angle to the tree is 35 degrees|dw:1367154463542:dw|
So... finding that question marked value should be a cinch... :)
Still blanked? \[\Large \tan(35^o)=\frac{?}{100}\]
ok its easy for me now I can do it now :) Thanks
Awesome :)

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