## goformit100 2 years ago 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?

1. goformit100

WTH ,You copy+paste !!!

4. terenzreignz

I will kill myself if I'm ever asked to do this mentally... or maybe I'll kill the instructor :P JK

5. goformit100

@Eyad Sir Sir Vector is among the weakest chapter of mine

@terenzreignz will do it ?

7. terenzreignz

Who needs vectors? |dw:1367154306851:dw|

8. goformit100

ok

Use Trig .

10. terenzreignz

The surveyor starts here...|dw:1367154405038:dw|

11. goformit100

ok

12. terenzreignz

Moves 100 metres.... So that the angle to the tree is 35 degrees|dw:1367154463542:dw|

13. terenzreignz

So... finding that question marked value should be a cinch... :)

14. terenzreignz

Still blanked? $\Large \tan(35^o)=\frac{?}{100}$

15. goformit100

ok its easy for me now I can do it now :) Thanks

16. terenzreignz

Awesome :)