# Thread: PreCalculus Law Of Sines/Cosines Help

1. ## PreCalculus Law Of Sines/Cosines Help

My normal approach here is not working, can anyone help?

2. ## Re: PreCalculus Law Of Sines/Cosines Help

Originally Posted by ineedhelplz

My normal approach here is not working, can anyone help?
angle between the sun ray and the hill = 30

angle between the tree and the down side of the hill = 112

angle between the top of the tree and the sun ray = 180 - (30+112) = 38

hillside distance = 215

use the law of sines to find tree height

3. ## Re: PreCalculus Law Of Sines/Cosines Help

Thanks, but where did 112 come from? I don't see where you got that.

4. ## Re: PreCalculus Law Of Sines/Cosines Help

Originally Posted by ineedhelplz
Thanks, but where did 112 come from? I don't see where you got that.
sketch a horizontal line that passes through the bottom of the tree ... what do you remember about alternate-interior angles?

5. ## Re: PreCalculus Law Of Sines/Cosines Help

Like this?

I'm not really sure what you mean.

6. ## Re: PreCalculus Law Of Sines/Cosines Help

that's not a horizontal line ...