My Math Forum  

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

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
January 13th, 2009, 03:50 AM   #1
Newbie
 
Joined: Jan 2009

Posts: 7
Thanks: 0

Trigonometry Angle help

Hi,
Im assusmin skipjack would be the first to ansear
I have had some question on trig and i could easily find the lines like e.g. whats the size of A-B
However when im doing this i either have to do SIN the angle ,TAN thhe angle,COS the angle.
But what happens if there is no angle.
This is what i do..
Firstly lets say
the angle is called "alpha" and we are using tangent aand opposite,
so we use TAN
next i did is
TAN "alpha" = lets say the sides are 6 which is the opposite and 3 the tangent
all i did was TAN "alpha" = 6/3
Now i did this on my calculator.
INVERSE TAN 3
iam shure i did everythign correct apart from last part so can someone explain please.
Thank you.
SuperMaths is offline  
 
January 13th, 2009, 10:03 AM   #2
Newbie
 
Joined: Jan 2009

Posts: 7
Thanks: 0

Re: Trigonometry Angle help

really appreciate if someone could tell me
SuperMaths is offline  
January 13th, 2009, 10:28 AM   #3
Newbie
 
Joined: Aug 2008

Posts: 4
Thanks: 0

Re: Trigonometry Angle help

I didn't quite get what the problem was, but I'll take an uncivilized chance..


tan(A) = opposite / adjacent

opposite = 6
adjacent = 3

tan(A) = (6/3)
A = ArcTan (6/3)
A ? 63,4
dogmira is offline  
January 13th, 2009, 12:12 PM   #4
Global Moderator
 
Joined: Dec 2006

Posts: 21,036
Thanks: 2273

If "there is no angle", you cannot proceed to say what the angle is called!

Also, if there is indeed an angle, and its tangent is 3, your calculator will have given you the value of the angle (to within a multiple of pi). If the tangent, 3, was calculated as opposite/adjacent, you know that the opposite side is three times the adjacent side.
skipjack is offline  
January 14th, 2009, 03:52 AM   #5
Newbie
 
Joined: Jan 2009

Posts: 7
Thanks: 0

Re: Trigonometry Angle help

thanks i understand it now
SuperMaths is offline  
January 16th, 2009, 12:08 AM   #6
Global Moderator
 
Joined: Dec 2006

Posts: 21,036
Thanks: 2273

If the opposite is 6 and the adjacent is 3, the tangent is 2. You can find atan(2) (or atan of any other value) using Google calculator (or any scientific calculator).
skipjack is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
angle, trigonometry



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Value of angle x MathematicallyObtuse Algebra 6 November 25th, 2014 04:38 PM
Calculating angle sin and sin angle without any functions. Gyiove Algebra 1 February 26th, 2014 04:57 PM
prove Angle DFE=3 Angle AEF Albert.Teng Algebra 26 February 19th, 2013 06:21 PM
The angle between two curves is the angle between kingkos Algebra 2 December 7th, 2012 05:34 PM
Trigonometry, finding angle when only one side length known lesterxburnham Algebra 5 June 15th, 2010 09:31 AM





Copyright © 2019 My Math Forum. All rights reserved.