# Properties of vectors

1. Sep 16, 2007

### innightmare

1. The problem statement, all variables and given/known data

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 100m along the riverbank to establish a baseline. Then she sights across a tree. The angle from her baseline to the tree is 35.0(degree). How wide is the river?

2. Relevant equations
I think this is a resultant vector problem. Where R(x)=A(x)+B(x), R(y)=A(y)+B(y). Then, Ill take the magnitude of both (R(x)+R(y))^1/2

3. The attempt at a solution

What I stated above is what I thought a solution, but Im stuck at the word "wide"? Not sure if Im on the right direction.
Thanks

2. Sep 16, 2007

### lylos

3. Sep 16, 2007

### Staff: Mentor

This is geometry/trig problem, not a vector problem. Draw yourself a diagram and you'll find a right triangle.

Looks like lylos drew one for you!

4. Sep 16, 2007

### innightmare

So how can i even go about solving this problem, if its a right triangle formula? This homework question was in the vector chapter of the book

5. Sep 16, 2007

### Staff: Mentor

To solve many vector problems, you need to know about right triangles. This should be an easier problem than many vector ones.