Sine and Cosine Laws When do You Use Each One

This video shows when you can use the Sine and/or Cosine Laws to find sides or angles in triangles.

[Stephen-ieuq]

So comprehensive and quick paced. No humming and hawing. Exactly what a tutorial should be.

[noblevenom]

thank you so very much, even after 10 years you're a lifesaver. I was able to get a 62% on my test and passed so now i dont have to redo the course in the summer, appreciate it.

[mlghitler]

this saved my ass man I got an 97 % on my math test thanks

[jt]

Very definitive, clear and easy to understand. I was having a lot of trouble figuring out when to apply each rule, now iv'e got it sorted. Absolutely ripping! Thanks!

[bensvab]

I'm in grade 10, u saved me from this, I was away for a while and didn't understand anything about this, I got an 80% on my test because I watched this until I got it, thanks, thanks and thanks again

[aidasolaty]

This is so helpful!! Thank you so much, I’m starting my math mock exam in an hour and I managed to understand the law of sine and cosine properly because of this video

[Zharlbarl]

This was so helpful.

I'm in a unique position where I'm teaching a student geometry, and geometry is NOT my subject. We've managed to get through things right up until the curriculum combined Law of Sines and Law of Cosines.

What the curriculum failed to make clear was that which law you use can be fluid and that there are multiple ways to arrive at the same solution when you're trying to find multiple variables (I was given an answer key which showed one way to solve a problem).

As a result, I was stuck puzzling over why one law was chosen over another in certain circumstances. The Angle-Side Pair idea and the idea of using cosine between two angles was enormously helpful. Above all though, when you used BOTH Law of Sines AND Law of Cosines to find the SAME missing variable was like opening my trigonometric third-eye. Law of Sines and/OR law of Cosines. Depending on the circumstances there are instances in which either law can be used to find one variable. It sounds so simple now, but this blew my mind.

Thank you for explaining this in such a way that it knocked me out of my rigidity. Both I and my student will undoubtedly benefit.

[Bentami]

Have an exam tomorrow and this really refreshed my knowledge on the laws, thank you!

[KyleCarrington]

Your work is beyond excellent Al. And to it, you add a tidiness (presentation) that is not seen elsewhere, which is icing ont he cake. Kudos to you.

[jamesmutter]

Very easy to follow you explained when and how to use each flawlessly. Thank very much got an A on test

[homesigns]

I teach trigonometry to seniors in high school. This video is perfect because it's clear and consise. Thank you for posting.

[XxJolie]

Very easy to understand!
Great Teacher!!
Thanks!

[budmi]

THANK U FOR SAVING ME! everything was explained really quickly and easily. LOVE IT! <3

[jamiejeffrey]

You definitely explain this much better than most of my tutors. Thank you very much.

[atalzazai]

Mr.AlRichards314 i was clueless on how to do trigonometry until i saw this video, i want to thank you from the bottom of my heart for helping understand what my teacher made seem like rocket science, i will proudly suit up and take my unit test tomorrow, thank you sir

[noemicivicprincess]

OMGGGG I CAN NOT THANK YOU ENOUGHH FOR THIS VIDEO I WOULD BE SCREWED FOR MY MATH TEST TOM. IF I DID NOT FIND THIS VIDEO!! Believe me I watched over 100 videos since 9 o clock and it's 12:08 and your video out of all the other videos happened to be like the holy grail!! And now I won't fail my math test tom!!!! Haha!!!! And I was absent for like 2 days and just being absent from math for 1 day every student knows this your technically screwed. So I wanted to say thankkk youu so much once again!! And l do not have a math brain what so ever and this totally helped me! And I got sooo excited when I figured it out because of this video i sent it to all my friends in my grade 11 math class because no one like gets it.

[nicksternc]

Thanks so much for the video. Passed my grade 10 math test because of you :)

[AlRichards]

Yes, the best term here would be "obtuse" since I was specifically refering to a triangle with an obtuse angle.

[vigmurali]

This video is extremely helpful! Thanks so

[kaconya]

Wow! The way you explained and broke everything down makes it crystal clear to me. Thank you so much! Much appreciated. I'm a subscriber now! :o)