WebGraphing.com Homepage Welcome Guest   | Login   
  Search  
  Index  | Recent Threads  | Who's Online  | Register  | Search  | Help  | RSS feeds


WebGraphing.com Forum »  List all forums »  Forum: Precalculus and Trigonometry Homework Help »  Thread: Law of cosine/sine

Quick Go »
Thread Status: Normal
Total posts in this thread: 2 		[Add To My Favorites] [Watch this Thread] [Post new Thread]
Author
Previous Thread This topic has been viewed 1173 times and has 1 reply Next Thread
Female nemmymath



Joined: Aug 24, 2010
Posts: 23
Status: Offline

Law of cosine/sine Reply to this Post
Reply with Quote
Find the requested information using the law of cosines and/or the law of sines. Round to three decimal places.

A triangle has sides a = 4 and b = 2 and angle C = 50°. Find the length of side c.

I tried using Law of cosine:
C^2=4^2+2^2-2(cos50)8
Am not sure if I was doing it right. Thanks for your help.
[Sep 1, 2010 10:21:57 PM] Show Post Printable Version     [Link] Report threaten post: please login first  Go to top 
Female pskinner

Member's Avatar


Joined: Apr 2, 2005
Posts: 797
Status: Offline
smile   Re: Law of cosine/sine Reply to this Post
Reply with Quote
 
Find the requested information using the law of cosines and/or the law of sines. Round to three decimal places.

A triangle has sides a = 4 and b = 2 and angle C = 50°. Find the length of side c.

I tried using Law of cosine:
C^2=4^2+2^2-2(cos50)8
Am not sure if I was doing it right. Thanks for your help.


Yes, you are doing it right! Compute the right side, then take the square root.
----------------------------------------
Principal Skinner
[Sep 2, 2010 6:35:18 PM] Show Post Printable Version     [Link] Report threaten post: please login first  Go to top 
[Show Thread Printable Version] [Post new Thread]

Powered by mvnForum 1.0.0 RC4 Update 2 (Build: 24 February 2005)
Copyright © 2002-2005 by MyVietnam.net