Triangles

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• May 7th 2007, 06:24 AM
pow3r2dapplz
Triangles
For both 1 and 2 use the Trigonometric Ratios Table in this link : Trigonometric Ratios Table

For number 1: Find the measure of angle A correct to the nearest degree.

For number 2: Find the measure of angle B correct to the nearest degree.

Could someone please explain to me how you get to the answer, i'm so confused! Help! Thanks in advance!
• May 7th 2007, 06:32 AM
earboth
Quote:

Originally Posted by pow3r2dapplz
For both 1 and 2 use the Trigonometric Ratios Table in this link : Trigonometric Ratios Table

For number 1: Find the measure of angle A correct to the nearest degree.

For number 2: Find the measure of angle B correct to the nearest degree.

Could someone please explain to me how you get to the answer, i'm so confused! Help! Thanks in advance!

Hi,

to #1: Use tan(A) = 5/10 = 1/2 and then use your tables.

to #2: Use sin(B) = 3/11 and then use your tables again.
• May 8th 2007, 04:38 AM
pow3r2dapplz
How do I find tan and sin? I mean, my math teacher never explained any of this! :confused: So confused..and I have a math final friday! Help!!!
• May 8th 2007, 04:47 AM
r_maths
Opposite = The length of the side opposite the angle you are finding.
Hypotenuse = Longest side of the triangle, ie. Opposite the right angle.
Adjacent = Remaining Side

Sin= Opp/Hyp
Cos = Adj/Hyp
Tan = Opp/Adj

SOH / CAH / TOA
• May 8th 2007, 04:51 AM
topsquark
Quote:

Originally Posted by pow3r2dapplz
How do I find tan and sin? I mean, my math teacher never explained any of this! :confused: So confused..and I have a math final friday! Help!!!

I find it VERY hard to believe your teacher never went over this. These definitions are the very basis of trigonometry. Check your notes, or the notes of one of your classmates.

-Dan
• May 8th 2007, 04:56 AM
pow3r2dapplz
It's sad to say but my teacher is a complete idiot!!! Everyone in the class is confused and he never explains the work he just gives us worksheets and expects us to automatically know it. It makes me really angry but...ok getting off track now. Sorry. Thank you for any help guys, I appreciate it.
• May 8th 2007, 06:04 PM
pow3r2dapplz
For number 1 I got : 1.1918

For number 2 i'm still confused :confused:
• May 9th 2007, 02:51 AM
r_maths
Your question asks:

"For number 1: Find the measure of angle A correct to the nearest degree."

and you have to use the table for this.

I already told you yesterday about Soh Cah Toa and earboth even showed you how to do it.

In triangle 1 you are finding angle A. You have the Opp = 5 and the Adj = 10
Tan uses Opp and Adj so tan must be used to find the angle.

Tan = opp/adj
Tan = 5/10
Tan = 0.5
From your table. 0.5 to the closest degree is 27.

In triangle 2,you are finding angle B.
You have sides Hyp = 10 and Opp = 3
Sin uses Hyp and Opp so you must use sin.

Sin = Opp/Hyp
Sin = 3/10
Sin = 0.3
From your table. The nearest angle is 17