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Geometry help!! - May 8th 2010, 03:59 PM

How do you find the measure of an angle? I have to get all of my missing work turned in by next week and I don't remember how to do it.
   
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Re: Geometry help!! - May 8th 2010, 04:43 PM

If it's a right angled triangle use Sine, Cosine and Tan.

x= the angle H= hypotenuse (the longest side) O = opposite to the angle you are given or trying to find A= adjacent to the angle you are given or trying to find.

Sinx = O/H
Cosx = A/H
Tanx = O/A

To find the angle just work out the O/H A/H or O/A bit and inverse whichever one from Sin Cos or Tan you used

If it's not a right angled triangle you'll need to use the Sine or Cosine rule. You can find a description of how to use it here http://www.teacherschoice.com.au/mat...e_trig_sss.htm


   
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Re: Geometry help!! - May 8th 2010, 05:04 PM

Quote:
Originally Posted by Darth Cara View Post
If it's a right angled triangle use Sine, Cosine and Tan.

x= the angle H= hypotenuse (the longest side) O = opposite to the angle you are given or trying to find A= adjacent to the angle you are given or trying to find.

Sinx = O/H
Cosx = A/H
Tanx = O/A

To find the angle just work out the O/H A/H or O/A bit and inverse whichever one from Sin Cos or Tan you used

If it's not a right angled triangle you'll need to use the Sine or Cosine rule. You can find a description of how to use it here http://www.teacherschoice.com.au/mat...e_trig_sss.htm
how do you find the angle measure using those? I know how to set it up i just don't remember how to find the answer.
   
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Re: Geometry help!! - May 8th 2010, 05:10 PM

The Sine and Cosine rule?

It should all be on that link I sent


   
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Re: Geometry help!! - May 8th 2010, 05:13 PM

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Originally Posted by Darth Cara View Post
The Sine and Cosine rule?

It should all be on that link I sent
They're all right angles so how would u find the measure of an angle using sine, cosine, or tan? Geometry is really hard for me.

Last edited by Worried_fiance; May 8th 2010 at 05:22 PM.
   
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Re: Geometry help!! - May 8th 2010, 06:16 PM

Quote:
Originally Posted by Worried_fiance View Post
They're all right angles so how would u find the measure of an angle using sine, cosine, or tan? Geometry is really hard for me.
If they're all right angle triangles then you know that 1 of the 3 angles is 90 degrees. If you are also given some of the lengths of the sides, then you can use the sin, cos and tan as described by Darth Cara. You may need to calculate some of the lengths of the sides if they are not given and for that, you use the exact same formulas, only you re-arrange to solve for the unknown variable (assuming you know the angle and another side length).

This link provides an example of a basic question involving calculating the sides (and re-arrange for angles) for a right-angled triangle: http://www.mathsrevision.net/gcse/pages.php?page=39.
   
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Re: Geometry help!! - May 10th 2010, 04:20 AM

You need to use the inverse function (sin, cos, or tan) to find the angle given side lengths. For example, sin x = opposite/hypotenuse. You can calculate o/h, which equals sin x, all you have to do is take sin(-1) of o/h, which is easy with a calculator, not so much without.



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