Results 1 to 5 of 5

Math Help - find the triangle

  1. #1
    Junior Member
    Joined
    Feb 2008
    Posts
    74

    find the triangle

    Find all solutions for each triangle.

    A = 30
    a = 4
    b = 8

    4 / 30 = 8 / SIN B

    4 SIN B = 8 ( SIN30 )

    SIN B = 8 (SIN 30) / 4 = 1

    Did I do that right?
    I know there is only one solution.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Banned
    Joined
    Aug 2008
    Posts
    530
    Yes, you are right.
    <br />
=\frac{4}{sin30}= \frac{8}{sinB}<br />

    <br />
sinB=1<br />

    <br />
B=90<br />

    Now, in right triangle, right angled at B,

    <br />
c=\sqrt{8^2-4^2}<br />

    <br />
c=\sqrt{48}=\;4\sqrt{3}<br />


    <br />
C=180-(90+30)=60<br />
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Feb 2008
    Posts
    74
    where did 90 come from?

    i get everything else.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Apr 2008
    Posts
    1,092
    Quote Originally Posted by topaz192 View Post
    where did 90 come from?

    i get everything else.
    90 degrees is the angle whose sine is 1.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Feb 2008
    Posts
    74
    Ooooh Ok duh. lol thnks!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: July 5th 2010, 08:48 PM
  2. Triangle. Find QT
    Posted in the Geometry Forum
    Replies: 2
    Last Post: May 23rd 2009, 08:49 PM
  3. Find H on this triangle
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: October 7th 2008, 03:23 PM
  4. Replies: 7
    Last Post: July 19th 2008, 06:53 AM
  5. Replies: 7
    Last Post: April 19th 2007, 04:01 PM

Search Tags


/mathhelpforum @mathhelpforum