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anonymous
 one year ago
Exact measures
anonymous
 one year ago
Exact measures

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campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0so do you know able the exact value ratios in trigonometry...?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes the sin, cos and tan

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I get the proportions mixed up!

Compassionate
 one year ago
Best ResponseYou've already chosen the best response.0@campbell_st , SOHCAHTOA isn't really a ratio. SOH = Sine OVER Hypotenuse CAH = Cosine over Hypotenuse TOA = Tanget over Adjacent

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0ok... so that's the easiest method... use the scaling factor of similar triangles... well here is the basic triangle dw:1443990164897:dw apply the scaling factor to the other sides to find the exact measures.

ybarrap
 one year ago
Best ResponseYou've already chosen the best response.0You can use law of sines: $$ \cfrac{a}{\sin C}=\cfrac{b}{\sin B}\\ \cfrac{5}{\sin 30^\circ }=\cfrac{b}{\sin 60^\circ} \\ $$ Solve for b Make sense?

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0so remember \[2.5 = \frac{5}{2}\] so multiply by the improper fraction rather than the decimal and then you don't have to worry about trig ratios

ybarrap
 one year ago
Best ResponseYou've already chosen the best response.0Use $$ \sin 60^\circ =\cfrac{\sqrt 3}{2}\\ \sin 30^\circ =\cfrac{ 1}{2}\\ $$

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0this has become to confusing for me... I'll let others answer the question rather than bombard you with options

ybarrap
 one year ago
Best ResponseYou've already chosen the best response.0*correction $$ \cfrac{a}{\sin \color{red} A}=\cfrac{b}{\sin B}\\ \cfrac{5}{\sin 30^\circ }=\cfrac{b}{\sin 60^\circ} \\ $$

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ybarrap, how would I solve based off of the proportion.. it's a little confusing for me

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.1I see from this question and the previous question you posted that you are studying the special right triangles. You are supposed to learn the relationships between the sides and angles of these special triangles so that you never have to calculate them again.

Compassionate
 one year ago
Best ResponseYou've already chosen the best response.0Lets say you have a triangle with Hypotenuse x, adjacent y, and opposite z. say I'm given the hypotenuse x's degree of 32 degrees, and I'm given an adjacent angle 10. Now all I can solve for is either the hypotenuse or opposite angle. So, if my test question said: find the hypotenuse I would say: Tan(32) = Adjacent/x Or: Tan(32) = 10/x

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.1Here's the deal: In the 454590 isosceles triangle, the legs are equal and the hypotenuse is the leg multiplied by sqrt(2) In the 306090 triangle, the leg opposite the 30 degree angle is 1/2 the hypotenuse and the other leg is the short leg multiplied by sqrt(3)

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.1You should memorize those two facts and practice enough that you can apply them automatically without using trig ratios or the law of sines or any of the rest of it.

Compassionate
 one year ago
Best ResponseYou've already chosen the best response.0@Mertsj , @campbell_st , @ybarrap  I anonymously elect @Mertsj to help this student  as we are confusing her with our differences in methods.

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0I bailed early because of the flood of information

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Mertsj, it's more easier for me when I actually set up proportions

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.1Do not take the easy way out, sweetheart. Trust the voice of experience. If you memorize these two special triangles, it will be a great benefit to you in the future.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok :) now that I wrote out the facts, how would that help me? I'm just so used to writing out proportions

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.0according to the previous question: you should include sin cos and tan ratios in your answer

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Nnesha, I'm not sure if i'm setting up the proportion up for a correctly. I wrote a=sin30

phi
 one year ago
Best ResponseYou've already chosen the best response.1It might help to look at an intro to trig https://www.khanacademy.org/math/trigonometry/basictrigonometry/basic_trig_ratios/v/basictrigonometry that will help you figure out the ratios

phi
 one year ago
Best ResponseYou've already chosen the best response.1but yes sin 30 = a/c and c is 5 , so sin 30 = a/5 multiply both sides by 5 \[ 5\sin 30 =5\cdot \frac{a}{5}\\ 5\sin 30 =a \]

phi
 one year ago
Best ResponseYou've already chosen the best response.1people memorize sin,cos, tan for the angles 0, 30, 45, 60, and 90 that is, you (should) know sin 30 = 1/2 so a= 5* sin 30 = 5* 1/2 = 5/2

phi
 one year ago
Best ResponseYou've already chosen the best response.1That is using trig. For "special triangles" 306090 and 454590 people memorize some "short cuts"

phi
 one year ago
Best ResponseYou've already chosen the best response.1Are you studying trig or "special triangles" ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok thank you :) for the length of b I got 5sqrt(3)/2 not sure if it's correct

phi
 one year ago
Best ResponseYou've already chosen the best response.1yes, b is \(5\sqrt3/2\) cos 30 = b/c sin 60 = b/c either way, with c=5, you will get b= 5 sqr(3)/2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0got it thank you phi!

phi
 one year ago
Best ResponseYou've already chosen the best response.1if you have time, get some popcorn and watch Khan's videos

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thanks for the advice :D definitely will do!
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