# S.O.S. Mathematics CyberBoard

Your Resource for mathematics help on the web!
 It is currently Sat, 18 May 2013 22:46:18 UTC

 All times are UTC [ DST ]

 Page 1 of 1 [ 5 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: (Newbie) Triangle ABCPosted: Wed, 21 May 2003 07:56:38 UTC
 S.O.S. Newbie

Joined: Wed, 21 May 2003 07:41:21 UTC
Posts: 2
Hi dear math-friends,

My question is too easy, sorry... I'm lawyer and forgot trignometry a long time ago. I need it again to some programming bitmap rotation.

Imagine a triangle ABC.
I know the 3 sides (AB, AC, BC).

I would like to get the A angle. What is the formula?

Thank you very much!
[[]]

Top

 Post subject: Posted: Wed, 21 May 2003 08:15:27 UTC
 Member of the 'S.O.S. Math' Hall of Fame

Joined: Fri, 2 May 2003 14:09:58 UTC
Posts: 2482
Location: In the pub, teaching Corneo how to pick up chicks...
Hey Supermario,

You can use the cosine law!

in your case, if you have AB, AC, and BC, to calculate the angle A, you would:

Let A be the angle

I'm assuming that this is for any triangle. If you have a right triangle, you can always use the trig ratios

Hope it turns out okay

Top

 Post subject: Thank'sPosted: Wed, 21 May 2003 08:53:51 UTC
 S.O.S. Newbie

Joined: Wed, 21 May 2003 07:41:21 UTC
Posts: 2

A fast and beautiful answer.

Thank's Mother Goose.

Regards,
SuperMario

Top

 Post subject: Could you do one for law of sines please?Posted: Thu, 22 May 2003 21:25:59 UTC
 Member

Joined: Tue, 20 May 2003 01:48:07 UTC
Posts: 28
That was the best illustration I have ever seen of the law of cosines. I wonder if you could do one for the law of sines. I really need this stuff done in a clear way.

Top

 Post subject: Posted: Thu, 22 May 2003 21:33:29 UTC
 Member of the 'S.O.S. Math' Hall of Fame

Joined: Sun, 4 May 2003 16:04:19 UTC
Posts: 2906
same diagram,

_________________
Has anyone noticed that the below is WRONG? Otherwise this statement would be true:

where

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 5 posts ]

 All times are UTC [ DST ]

#### Who is online

Users browsing this forum: No registered users

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forum

Search for:
 Jump to:  Select a forum ------------------ High School and College Mathematics    Algebra    Geometry and Trigonometry    Calculus    Matrix Algebra    Differential Equations    Probability and Statistics    Proposed Problems Applications    Physics, Chemistry, Engineering, etc.    Computer Science    Math for Business and Economics Advanced Mathematics    Foundations    Algebra and Number Theory    Analysis and Topology    Applied Mathematics    Other Topics in Advanced Mathematics Other Topics    Administrator Announcements    Comments and Suggestions for S.O.S. Math    Posting Math Formulas with LaTeX    Miscellaneous