Cosine Rule Finding a Side - VividMath.com

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How to find a missing length using the Cosine Rule (Law of Cosines).
"Trigonometry Cosine Rule" "Trig" "Maths" "Angle Geometry" "sin cos tan" "Cosine Rule Finding An Angle" "Cosine Rule Proof" "Trigonometry Cosine Rule" "How to use cosine rule" Cosine Law" "Trig" "Maths" "Angle Geometry" "How to" "sin cos tan" "Cosine Rule Finding An Angle" "Cosine Rule Proof" "Trigonometry Cosine Rule" "Trig" "Maths" "Angle Geometry" "sin cos tan" "Cosine Rule Finding An Angle" Cosine Law" "Cosine Rule Proof" "Trigonometry Cosine Rule" "Trig" "Maths" "Angle Geometry" "sin cos tan" Cosine Law""Cosine Rule Finding An Angle" "Cosine Rule Proof" "Trigonometry Cosine Rule" "Trig" "Maths" "Angle Geometry" "sin cos tan" Cosine Law""Cosine Rule Finding An Angle" "Cosine Rule Proof" "Trigonometry Cosine Rule" "Trig" "Maths" "Angle Geometry" "sin cos tan" "Cosine Rule Finding An Angle" "Cosine Rule Proof" Cosine Law"Cosine Law" "How to"
See all Trigonometry lessons: vividmath.com/trigonometry/tr...
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[@Crazzy-5173]

If you want you can plug into a calculator if it does bidmas
Squareroot overall then
(17*+20*)-(2(17)(20))cos(48)

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I followed along with this and I think u got it right

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* I got it right

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[@colethamansueti-qd6wc]

Is it must to be given the value of b and c and the angle

[@Pandorarl]

I would still like a reason why the second part of the formula is as it is.
My thought process is that since the first part is the pythagorean theorem of a right hand triangle then the second part must be the difference of the length if the right angle triangle would be less degrees. The cosine we can use to find the influence a vector on an angle has on another, but I'm still not sure about where exactly where the multiplication of the two other sides come in (2bc)

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[@sukhmeetlayal4361]

It was supposed to be 435

[@Risulfur]

Why 15.3 and not 15? In the beggining of the problem there were given 3 different numbers and all of them had only 2 significant numbers (20, 17, 48)

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Because this is a maths problem so we assume presicion. Where as if it was a physics question you would absolutely be right

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but very helpful nice

[@CalviNsiku]

Why didn't he the cos48 🙄🙄

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Better than my fucking teacher

[@jackdaw9418]

No it came out as 15.3 for me

[@theophonchana5025]

cos (48°)

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[@invokergaming4991]

i think its gonna be -435 instead of -455

[@PristineReviews]

same whats going on here

[@PristineReviews]

so incase you were still looking for the solution, its that our calculators were set to RADIAN mode. just have to change it to DEGREE mode

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I watch like 20 videos by now and spend a couple of hours googling and still NOBODY has said what "cos" is. Is it something that everyone just know and I have a genetic mutation which misses it out from my brain?

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Cos means Cosine :)

[@Paul-ob2hy]

Tad Ka cos means cosine, think of this as a scientific ratio you apply to numbers of degrees.

[@Risulfur]

Cos alpha = Xalpha, look up trigonometry

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[@mrsmurferson384]

To think they would have found an easier way to do this in the last 11 years😢

[@adityakewalramani1374]

he was not calculating anything he was looking on the right and the answer was on the right each time

[@Jason-wy7wx]

680 x 48 is not 455 please someone help me he said "680xcos48" help i have spent 1 hour just rewatching his videos to see if he tells us something

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cos is a button on your scientific calculator to work out the that style of triangle

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[@Conquerorbrown]

focus on the procedure and use your calculator to do the rest. make sure your calculator is programmed to degrees and not radians. He may have rounded off the value.

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I also like this

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put your decimal point lower

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you guys notice all mathematics teacher is not as good

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this guy dose not know that two negatives make a positive. the answer is 33.5305554806cm

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