# Simple intro to physics question

1. Sep 1, 2004

### a_j

Ok. This is a fairly simple question since it is problem #11 of Chapter 1! Yet, I cannot do it. (Hopefully this isn't a sign of things to come).

Anyway, basically the problem goes like this....

A monument rises to a height of 192m. You estimate the line of sight with the top of the arch to be 2.0 degrees above the horizontal. Apporximately how far (in km) are you from the base of the arch?

The answer is 5.5km, but I cannot get this. I can't figure out which inverse trig funtion to use. The closest I came was 6.7.

Please explain which trig function and why its that function. I tried the tangent of 2.0 and a few other methods and haven't came up with anything.

$$\tan{2^\circ} = \frac{194{\rm m}}{d}$$