Law of Cosines, Finding Angles & Sides, SSS & SAS Triangles - Trigonometry

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This trigonometry video tutorial provides a basic introduction into the law of cosines. It explains how to use the law of cosines formula for finding angles and for finding the value of missing sides. It explains how to solve the sss triangle and the sas triangle using the law of cosines first and then finishing up the problem using the law of sines formula. This trig video contains plenty of examples and practice problems.
Solving Trig Equations - Finding All Solutions:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-kEcbxiLeGTc.html
Solving Trig Equations With Multiple Angles:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eZPEW2hVUd0.html
Solving Trig Equations With Double Angles:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--R7394Dn854.html
Law of Sines:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8qezAG2r0sk.html
More Examples - Law of Sines:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9fS0uA4iLxI.html
Area of an Oblique Triangle:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vPt6j5e_uhE.html
______________________________
The Height of a Triangle - Heron's Formula:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-a1PR9O1Va84.html
Polar Coordinates:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-aSdaT62ndYE.html
Polar Equations to Rectangular Equations:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-flTz_pSzVFI.html
Rectangular Equations to Polar Equations:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fTBkr27r3pw.html
How To Graph Polar Equations:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jO4lwddfeDA.html
_________________________________
Complex Numbers - De Moivre's Theorem:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-J6TnZxUUzqU.html
Dot Product of Two Vectors:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VzX8KJKFhlM.html
Trigonometry Final Exam Review:
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-OAsbx4TEnL0.html
Final Exams and Video Playlists:
www.video-tutor.net/
Full-Length Videos and Worksheets:
www.patreon.com/MathScienceTutor/collections

Опубликовано:

22 окт 2017

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Комментарии : 455

@TheOrganicChemistryTutor Год назад

Final Exams and Video Playlists: www.video-tutor.net/ Full-Length Videos & Worksheets: www.patreon.com/MathScienceTutor/collections Next Video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-aSdaT62ndYE.html

@robsonrobinzo-ow7em 9 месяцев назад

when I see organic I don't hesitate to click then everything goes as expected always

@502Bentley 4 года назад

With classes now online, you are basically my teacher now..

@yasshi4796 3 года назад

Same

@riseruchan3616 3 года назад

Relatable, our prof doesn't teach us a thing. Smh.

@blackholedividedbyzero 3 года назад

His everybody's teacher

@jhfdoggy8788 3 года назад

I find it so extremely Erie that this comment now says 1 year ago.

@mq-r3apz291 2 года назад

how did he convert to degrees? I know how to convert with pi/180 to radians but got something different. At what part did he convert?

@Yellowbrick559 3 года назад

There are a ton of math tutorial videos on RU-vid, but there is something about the way you explain things and the calming presence of your voice that makes it so much easier to understand. I always watch multiple videos on the same subject only to find yours and things finally click. Thanks so much for what you do!

@ralphcesaryabut6668 5 лет назад

Not all heroes wear capes. I owe you my entire semester.

@user-zf4fh9pf8m 2 месяца назад

I hate math

@amiralihamidian6762 Месяц назад

Ur not alone

@ondniwa Месяц назад

i used to be, you won’t be hating it as much after you learn more of it

@AbdulrahmanAyman-og7tf Месяц назад

I’m the opposite of you

@user-ir4wn6qs5t Месяц назад

@@AbdulrahmanAyman-og7tfi disliked your comment

@Findgod222 Месяц назад

Who doesn’t. I have to relearn all this sht for my final. This sucks ass. I hope I don’t have to do math ever again after I graduate.

@Nadia-hj6tc 4 года назад

the only youtube channel that actually helps me with math. bless u sir

@Dailydoseofstupitity2 7 месяцев назад

potato salad

@GhostTheCreator 6 месяцев назад

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@user-mq5ms1wf9y Месяц назад

You know ,i listened to my teachers for many years to understand those methods You did better in 10mins You're the 21s legend brother

@zah1377 5 лет назад

You is a gift from God, You are a blessing,, and I want to say Thank you very much. You make everything that seemed hard at first easy. Thank you and God bless you.

@TheOrganicChemistryTutor 5 лет назад

You're welcome

@focusonme7616 5 месяцев назад

@@TheOrganicChemistryTutorCan you be my husband sir

@lord-draco 3 месяца назад

Seriously nhgal @@focusonme7616

@GP-ed2ch Год назад

idk why you teach me more than a 90 minute lecture man. Thank you so much

@pear2369 4 года назад

When your math teacher uses the easiest problems for examples, you don’t learn much..

@planecrazy3808 4 года назад

Boi I dont know how I am learning more here than in class.

@jashin888 3 года назад

This is literally my teacher and I wanna smack the shit outta her

@Naman_JEE25 4 месяца назад

It's just illustration To show how the formula or general result works The part of problem solving is upon you

@sigrid.5994 4 года назад

Just got a 94 in my Trigonometry class because of you ❤

@DEWHighlights Месяц назад

Bruh I still got a D+ on my quiz. Man, math isn’t for me😢

@lincolnscott1877 2 года назад

Thank you so much, Organic Chemistry Tutor! You're so helpful to many and many of us wouldn't understand these lessons without you

@awarnick84 3 года назад

Thank you for doing these. Your explanations are SO clear and concise.

@georgesadler7830 2 года назад

MR. Organic Chemistry Tutor, thank you for another awesome video on The Law of Cosines. This is the backbone of Trigonometry.

@Fawaffles 3 года назад

The way his teaching and his calm voice make me never stress when studying while watching this dude

@Misty-nd8xm 2 года назад

I agree my guy :)

@akari2178 Год назад

I take my GED this year, your videos are really helping me out! Thank you so so much! Your explinations are so clear and really helpful! God bless you sir :)

@bellelirazan5970 2 года назад

Thank you so much for this, I was very confused when this was first discussed to us, now I fully understand the lesson. Please continue to upload more videos, you saved us all - an online class student

@jananiu6430 5 лет назад

my ninth grade ass skipped classes so i really needed this lmao

@benben-ro1cr 4 года назад

where are you from lol?

@lilyscott9902 4 года назад

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@d0d0birdiexd78 4 года назад

Jesus 9th grade? Im doing this in 11th grade!

@jananiu6430 4 года назад

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@jananiu6430 4 года назад

@@d0d0birdiexd78 Damn really? learned this in grade 9 and 10

@romantitus3341 Год назад

As usual, I learn more about law of cosines in this video then a teacher that taught this for 2 weeks and I had no idea until I saw this.

@Ka1sserrr 4 месяца назад

Without you I wouldn’t be able to maintain an A in my class I am eternally grateful

@billcipher5508 2 года назад

THANK YOU!! Very clear, and a relaxing voice!! I used this for one of my math problems because I didn’t understand how to use the formula at all!! Turns out, I didn’t need to do that problem but now I know how to use the formula and I have a test in two days so 🤷‍♀ sweet ig lol

@phyllismurphy6540 3 года назад

He is the best. I always go to him first. So patient and kind. I sure would like to see his face.

@krattgirl124samarama4 4 года назад

I have my ACT coming up in a few days so this video really helped me with things I forgot

@oyingiwahouse_of_majestic254 3 года назад

Wow you solve questions so easy, I rent to understand perfectly when even I watch your videos.

@agnieszkaelainegarcia2580 Год назад

thank you so much, you help so many students

@espinarusseljohnc.8022 3 года назад

You've helped me a lot I passed my subject in calculus1 coz of you thank you!

@JanePlayz 2 месяца назад

I literally have 1 night to cram this and you're saving me

@shawnlytle266 3 месяца назад

Thank you for this video. Very helpful because I had to miss a class this week and this easily summed up the information that I had missed.

@user-op9gf8lt2z 5 месяцев назад

Your videos helped me a lot and I’ve shared your channel to my friends too so that they can benefit from your videos

@Gabs_oce 3 месяца назад

3 years later, helping me pass my demonstration of learning 🙏🏼🙏🏼🙇🏼‍♀️

@sabrinaviloria2027 4 года назад

My math teacher hasn’t taught us anything the whole quarantine, you just saved me sir thank you:)

@christophernguyen8083 3 года назад

Thank you for this I'm sure I know how to do this, but it's been a while since I've done math. I am currently in engineering by the way.

@radenfearless 11 месяцев назад

This is simply a brilliant help in systematic preparation🤗

@nanafisiiahi Год назад

Thanks for helping me pass Geometry! Real one fr‼️

@user-op9gf8lt2z 5 месяцев назад

I swear to god you’re the best mathematician I’ve been watching your videos since and I can now boldly say that I’m not afraid to solve maths questions because your explanations is top notch ❤

@Visichy Год назад

I've got a math test tomorrow and you just helped me understand all of this so much better than my teacher thank you

@PureLuck21 5 лет назад

first ever video on youtube that actually helps

@nikolai4380 Год назад

there is a better formula for SSS, like cos C= a2+b2-c2 /2 x a x b, cosA= b2+c2-a2 / 2 x a x b, cosB= a2+c2-b2 / 2 x a x c

@andrewmorrissy3122 Год назад

Organic chemistry tutor clutching again for my statics exam bless up ❤️

@ronnahzulu4506 Год назад

God bless you ❤️❤️😩 I never knew trig can be this easy ❤️❤️❤️

@jada9360 2 года назад

The best thing is that you slove some example sums. That really helps

@ismaeltapia7238 4 года назад

This is easy thanks,so this applies to everything in the law of cosine right or is there something else we need to learn ?

@didacemugemana7095 10 месяцев назад

thank u for everything these videos improve our understanding may GOD bless u

@michaelnwoye2103 2 года назад

You are a nice tutor Your videos have helped me alot even when I’m preparing for exams You take your time to go into details and your explanations makes me understand what i want to know Thank you so much

@shinshin744 5 месяцев назад

as a struggling grade 8, this helped me alot since i couldnt even answer any of the math questions when its trigonometry class since i was always absent on mondays thank you so much

@crichellerevilla7552 2 года назад

Thank you for saving my struggles😊😊☺️

@nizavillanueva6285 2 года назад

It is so great !! Best explained

@steveturner1680 2 года назад

Do you use your computer mouse to write? Thank you so much! Our teacher is moving to Maine so it looks like we really need u :/

@psychopathic3082 Год назад

This vid has clear objective and has more detail and easy to follow up with his every equation than my online classes! Online class are boring! Wasting our 10 mins for one example and this vid is only few minutes LOL 😂

@jakeghaust5550 5 лет назад

Thanks for the help it’s easy now

@matto2971 4 года назад

Good explanation. Thank you.

@user-ur1xo6rj7p 4 месяца назад

YAAAGGHHH!! I have been studying and rn i think i have some idea on this topic. i will cm bk and report if i learnt anything from this video!! edit: at first i thought there was a problem but watching ur video, i was able to find a mistake in my workings. Thanks!

@bernstein9476 3 месяца назад

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@BasmaHadil-ww2ru Месяц назад

What sm mean?

@YourOwnAdventure 11 месяцев назад

I'm not sure if you do it on purpose, but I enjoy it when you call incorrect laws, angles, etc. to keep us sharp!

@heyman6087 9 месяцев назад

You help me so much in the times I need it

@sykovskatarina8489 4 месяца назад

5 min before the test. Run this vid at 2x and you’re set

@Coco-chrispy 3 месяца назад

Lmaoo let me know how you did

@nadeenhameed5808 2 года назад

I’m a little confused because teacher gave me the formula cos

@iane.2155 Год назад

Good luck for my exam tommorow. Thanks OrgChemTeach!

@anonymouss5661 3 года назад

😂Who else is watching this before a math exam😅

@Thuwiba. 3 года назад

before one hour of exam 😭😂😂

@salaarasim3038 2 месяца назад

3 hours before

@Rebrodie 2 месяца назад

1 hour and a half b4 exam 😭😭

@gameanation4311 Месяц назад

MY TEST IS TODAL LAMO 💀

@bhoot._.56 5 месяцев назад

bro taught me more maths than my actual maths teacher

@orangejuice8339 3 года назад

9:05 Isn’t angel A= 180- angel C - angel B which is equal to 180- 73.4 -48.2= 58.4 ? Also thank you for your lessons they’re really helpful.

@louieryannadela6262 4 года назад

I have a question if you use arc sign you will answer a whole number or not?

@UchihaJade6969 4 года назад

what app did you use for editing project purposes only?

@megaminakahara1547 6 лет назад

The answer from the SSS which is sin 73.40 is 0.958323 convert to 4 decimal 0.9583

@lucidfangirl1030 3 года назад

where did the A=130-something come from? At the end?

@tigershark2772 Год назад

yes, the videos from 2006 are really helping cause as far as I know, math hasn't really changed and im still passing.

@dragonninja9908 Год назад

Thx bro, rlly saving me from catastrophic failure rn

@vascobishop3359 11 месяцев назад

Perfect explanation.

@virgiliojose9153 2 года назад

2:55 i don't get where did you get the cosine, i calculated the cosine but the result isn't same as in the video

@elijahsouthern9198 2 года назад

When do you know to have your calculator in radian or degree mode?

@Johnboard. Год назад

It's feels useless going to school when you exist

@kina2574 3 года назад

You're a life saver

@izyansyed2817 2 года назад

4:04 angle c is 60 not 30 btw This really helped me for my test tomorrow

@free_Sdot Год назад

Better than my math teacher

@nielsdaemen 3 года назад

7:48 **Law of sine's!*

@sheilamaegohol1639 3 года назад

How about side A, C and c is missing? What formula can be used?

@randommeep 2 года назад

Do we only check for another possible solution if given SSS?

@mareksogars2954 3 года назад

I’m so confused, on the last question i found A first, which was infact 48.2 degrees, but then i got B = 40.5 and C = 91.3, all of which added together = 180. I’ve skimmed through my working and can’t find anything wrong

@SarrouTube Год назад

Excellent !!!!

@liamhoward2208 4 года назад

7:48 it’s the law of sines not the law of cosines

@AubreyLJohnson 4 года назад

Not really a big deal :/

@user-hb9dy4jf2k 4 года назад

At least he taught us. I have a test tomorrow

@evloghmenosxxx4035 3 года назад

Thanks , some better than my maths teacher

@jhynx2081 2 года назад

I PASSED!!! THANK YOU SO MUCH I OWE YOU A LOT

@conk1 2 года назад

@twotonecloudboxing1471 Год назад

I understood everything up unto the cos -1 multiplied by the resulting number can someone please explain how to do this on an iPhone calculator would be very much appropriated?

@Keniasocool 3 года назад

where did you get 131.8 from? (9:09)

@froppy9086 3 года назад

u saved my final test thank you ;-;

@maanned.4900 2 года назад

Thank you so muchhhhhh!!!! ❤️❤️❤️

@FUNXP12 2 года назад

Thank you very much

@amateurkitchen7073 Год назад

is it possible to still use the cosine rule all through to get the same answers

@elliottmaccrone328 Год назад

this man is a godsent

@Thuwiba. 3 года назад

Thank you so much 💖

@kaylinburchette575 2 года назад

Thank you sooooo much!

@avaSdivya 4 года назад

You are the best!

@nicogarcia7451 4 года назад

Dude thank you so much.

@fredhedengren161 2 года назад

really well done....thks.

@Someone-jm3pk Год назад

I'm sorry I didn't get how we find another answer Why should we 180-theta Don't their cosines have different signs? Thank you very much

@lancejaredcayabyab2719 3 года назад

thank you, sir! as much as i love learning math, i kinda hate this topic. i always find math amazing when you get to do ways to shortcut things, but this topic needs long solutions. wish me luck :))