Math Help Forum

Math Help Forum Feed Site Feed

Go Back   Math Help Forum > Pre-University Math Help > Trigonometry
Reply
 
Thread Tools Display Modes
  #1  
Old May 13th, 2008, 04:55 PM
Junior Member
 
Join Date: Jan 2008
Posts: 56
Country:
Thanks: 5
Thanked 0 Times in 0 Posts
zachcumer is on a distinguished road
Default using trigonometry to find length

Hello All.

Here is the problem: You have a triange (no right angle anywhere in sight) They (my math teacher) gives you the angle 76 degrees. They give you an angle with 53 degrees. They give you side "w", which is opposite the angle 76. Finally they give you a side length of 25.

Find W.

To find W I thought I would have to either use the law of Cos or the law of Sin.

Which one!?

thanks!
Reply With Quote
Advertisement
 
  #2  
Old May 13th, 2008, 05:44 PM
Morphayne's Avatar
Junior Member
 
Join Date: May 2008
Posts: 31
Country:
Thanks: 21
Thanked 1 Time in 1 Post
Morphayne is on a distinguished road
Default

Use the sine law.
Reply With Quote
  #3  
Old May 13th, 2008, 05:52 PM
Junior Member
 
Join Date: Jan 2008
Posts: 56
Country:
Thanks: 5
Thanked 0 Times in 0 Posts
zachcumer is on a distinguished road
Default

my final answer was 97 degrees.

sin(x)/37 = sin(50)/29

29 sin(x) = 28.34

divide by 29

you get roughly 97 degrees
Reply With Quote
  #4  
Old May 13th, 2008, 06:10 PM
Morphayne's Avatar
Junior Member
 
Join Date: May 2008
Posts: 31
Country:
Thanks: 21
Thanked 1 Time in 1 Post
Morphayne is on a distinguished road
Default

Quote:
Originally Posted by zachcumer View Post
my final answer was 97 degrees.

sin(x)/37 = sin(50)/29

29 sin(x) = 28.34

divide by 29

you get roughly 97 degrees
Weren't you looking for side w?

a/sinA = b/sinB

w/sin76 = 25/sin53

w = 25 sin76/sin53

w = 30.4
Reply With Quote
The following users thank Morphayne for this useful post:
Donate to MHF
  #5  
Old May 13th, 2008, 06:20 PM
Junior Member
 
Join Date: Jan 2008
Posts: 56
Country:
Thanks: 5
Thanked 0 Times in 0 Posts
zachcumer is on a distinguished road
Default

sorry I was looking at the wrong question...yeah your right!
thanks
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off
Forum Jump


All times are GMT -7. The time now is 09:18 PM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.2.0 ©2008, Crawlability, Inc.
©2005 - 2009 Math Help Forum


Math Help Forum is a community of maths forums with an emphasis on maths help in all levels of mathematics.
Register to post your math questions or just hang out and try some of our math games or visit the arcade.