# PreCalculus Law Of Sines/Cosines Help

• Oct 13th 2011, 02:24 PM
ineedhelplz
PreCalculus Law Of Sines/Cosines Help
http://i.imgur.com/JbwEw.jpg

My normal approach here is not working, can anyone help?
• Oct 13th 2011, 02:40 PM
skeeter
Re: PreCalculus Law Of Sines/Cosines Help
Quote:

Originally Posted by ineedhelplz
http://i.imgur.com/JbwEw.jpg

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
• Oct 13th 2011, 03:04 PM
ineedhelplz
Re: PreCalculus Law Of Sines/Cosines Help
Thanks, but where did 112 come from? I don't see where you got that.
• Oct 13th 2011, 03:10 PM
skeeter
Re: PreCalculus Law Of Sines/Cosines Help
Quote:

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?
• Oct 13th 2011, 03:16 PM
ineedhelplz
Re: PreCalculus Law Of Sines/Cosines Help
Like this?
http://i.imgur.com/YQax8.jpg
I'm not really sure what you mean.
• Oct 13th 2011, 03:20 PM
skeeter
Re: PreCalculus Law Of Sines/Cosines Help
that's not a horizontal line ...