My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum

LinkBack Thread Tools Display Modes
March 13th, 2008, 02:40 PM   #1
Joined: Mar 2008

Posts: 6
Thanks: 0

Triangle side lengths

how do u find x?
lax600 is offline  
March 13th, 2008, 03:39 PM   #2
Global Moderator
Joined: May 2007

Posts: 6,454
Thanks: 567

Re: Triangle side lengths

Originally Posted by lax600

how do u find x?
Let c=x

use the law of cosines


In your case a=15, b=16, C=58 deg are known.

Assuming the angles are correct you could also use the law of sines

a/sinA =c/sinC where A=64 deg.

If you don't get the same c both ways, then the data given is incorrect.
mathman is offline  
March 13th, 2008, 07:25 PM   #3
Global Moderator
Joined: Dec 2006

Posts: 18,719
Thanks: 1536

It's pretty obvious that the given measurements are inconsistent. The third angle would be 58, making the triangle isosceles and hence x equal to 16. That's nonsense, since the shortest side can't be opposite the greatest angle.
skipjack is offline  

  My Math Forum > High School Math Forum > Algebra

lengths, side, triangle

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
inequality concerning lengths of a triangle Albert.Teng Algebra 3 February 20th, 2013 11:19 PM
Basic trig, solving side of triangle daigo Trigonometry 4 July 2nd, 2012 11:32 AM
same sum of terms on every triangle side azul Elementary Math 3 November 14th, 2011 10:58 AM
Find lengths of the triangle ? zgonda Algebra 9 August 27th, 2010 02:18 PM
Missing side of a triangle manich44 Algebra 8 March 19th, 2010 08:56 AM

Copyright © 2018 My Math Forum. All rights reserved.