Introduction to conic sections | Conic sections | Algebra II | Khan Academy

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  • Опубліковано 16 гру 2024

КОМЕНТАРІ • 206

  • @joelmorris214
    @joelmorris214 8 років тому +373

    KHANic sections.

    • @superroydude
      @superroydude 7 років тому +1

      XD, you beat me to it.

    • @MechaDragonX
      @MechaDragonX 7 років тому +1

      Areeb Shahjahan beat both of you by two years!

    • @tennoskuum9632
      @tennoskuum9632 5 років тому

      You stole my joke

    • @tonybaston3419
      @tonybaston3419 4 роки тому +2

      I just come here with the sole intention of making that joke

  • @khanacademy
    @khanacademy  15 років тому +74

    Great to hear that. Maybe I can do a series of videos on why bones break and how they heal (dedicated to you of course!). Actually, that's a pretty good idea. Need to do the basic bio first to do the healing part.

  • @pongman
    @pongman 15 років тому +28

    Thank you Sal. I work in an orthopaedic office and everyday I send all the kids that come in, to your website. The moms and dads come back to thank me for the info. When I talk to the kids I ask them how their math is in school and they look at me and say, "well I passed!" and then there's a chuckle. I've become a hit for them because they leave with more than a cast.

  • @khanacademy
    @khanacademy  15 років тому +44

    Still trying to work out how to arrange the plane and the cone to get that.

  • @pigmentsonpapers1647
    @pigmentsonpapers1647 2 роки тому +10

    If only I had learnt from you Sir. I would have feared maths less and be fascinated by its beauty more. I now understand why some people's eyes have a glint when they talk about maths. Thank you for your contribution.

  • @Tehcarp
    @Tehcarp 15 років тому +2

    It's one part talent and one part that he cares.
    A rare combination. Far too rare.

  • @loverofbeats
    @loverofbeats 14 років тому +16

    you're an amazing teacher! thank you for your time, sounds like you truly have a passion for teaching :D

    • @N.asper02
      @N.asper02 17 днів тому

      I just saw this account was 17 years ago, please do tell how it's going this far? That's cool

  • @KickinAss1000
    @KickinAss1000 7 років тому +18

    Your comparison of the two dimensional plain representing a single cross section of a three dimensional object completely just changed my picture of geometry, thank you.

  • @urielruss
    @urielruss 4 роки тому +4

    Dude you are amazing. If everyone learned math like this, we would have a world of geniuses. Thank :)

  • @hunterepicness4303
    @hunterepicness4303 2 роки тому +2

    Wow just realized this video is over 12 years old.... and thanks to this over-a-decade old video I for the first time finally understand those conic figures at the end. They always looked so complicated but I finally understand it now!

  • @pizzapleope6595
    @pizzapleope6595 2 роки тому +6

    this video is older than me and i still learned loads thanks man

  • @norwayte
    @norwayte 15 років тому +6

    Thanks for the relations between them. I'm looking forward for the different equations for the ellipse.... parameter.... polar.... etc. and how they relate to each other. You have the gift.

  • @linuxguru27
    @linuxguru27 2 роки тому +1

    wonderful explanation, I am programmer, and maths always attracts me, and i was rusty and checking what i studied 21 yrs ago, and wallah this explanation is clear, and i re-learned the things today.
    Thank you for such wonderful lesson.

  • @abbybasile936
    @abbybasile936 9 років тому +39

    ATTACK OF THE COLORED LINES!!

  • @Theoryclash
    @Theoryclash 13 років тому

    Thank you so much.
    You can not understand how greatly thankful I am to for you, you're what we need in front of our classrooms and at our dining tables teaching kids things.
    Just, thank you.

  • @potatopumpkin6925
    @potatopumpkin6925 4 роки тому +1

    Thank you Sir! I graduated high school with your help!! Thankyouu

  • @spanishbeard9654
    @spanishbeard9654 10 років тому +62

    At 2:30 you have a smiley face lol

  • @venkateshprasad0
    @venkateshprasad0 11 років тому +1

    I guess you never heard of Khan Academy,just search for khanacademy on google and visit their website and browse through the entire collection of video lectures.

  • @adeedeedeetv
    @adeedeedeetv 13 років тому +1

    My teachers motto this semester:
    Learn it yourself I am being fired for DUI!
    Joy.
    Thanks to you I learned conics and logarithms

  • @Waranle
    @Waranle 15 років тому

    Everytime i open one of your videos, i learn something new... that is the joy of watching your videoz, Thank you Sal

  • @Jakers2009
    @Jakers2009 15 років тому

    Sal you really are amazing... I mean I'm sure there are some guys out there who do reasearch into things and work out complicated stuff but I'm not sure they understand things like you do.... and definately do not present or explain things as well...

  • @bxcraftplayz1386
    @bxcraftplayz1386 2 роки тому +1

    Thank you khan academy

  • @VideoOfMike
    @VideoOfMike 15 років тому +2

    YES!!!!!!!
    The canadian education system skipped THE ENTIRE CONIC SECTION on PURPOSE!!! and the SAT math II REQUIRES CONICS!!!!!!!!!!!!
    THANKS!!!!!!!!!!!!!!!!!!!!!!!!!!

  • @nvjolley
    @nvjolley 11 років тому +2

    I actually fell asleep your voice is so soothing.

  • @raygodinez1501
    @raygodinez1501 8 років тому +6

    most excellent! good explanation.

  • @AlphaCrucis
    @AlphaCrucis 15 років тому +1

    Thank you for this. I'm trying to learn the topics I missed in High School to prepare for college this fall. Is this in a playlist yet? Which playlist would it be? Conics or precalc?

  • @autumnseptember1674
    @autumnseptember1674 3 роки тому +1

    You are amazing.🤓

  • @emoalexisemoful
    @emoalexisemoful 11 років тому

    I would never pass without you Sal, thank you very much!!!!!!!!

  • @yyourfacee
    @yyourfacee 14 років тому +2

    your drawings are amazing

  • @guyses4983
    @guyses4983 4 роки тому +1

    thx huge help for my class

  • @PapaGotSkills
    @PapaGotSkills 13 років тому

    I wish I had you as a teacher, your brilliant

  • @pongman
    @pongman 15 років тому

    Oh you're too kind. It would be a neat idea and I'm quite certain some first year ortho resident would find it most appreciative to see this on You Tube as well as the kids who go on your website to learn how bones heal as well as break. I think you explained Wolf's Law in one of your physics videos.

  • @harshathkanadka1672
    @harshathkanadka1672 4 роки тому

    Dude the best channel !!! 1000×better than byjus

  • @LiinksGaming
    @LiinksGaming 5 років тому +1

    Dude this video is still useful even after 10 years of when it was published

  • @galikazoid
    @galikazoid 15 років тому +1

    thanks for doing what you do; mathematics is fascinating

  • @dougd120
    @dougd120 5 місяців тому

    I like the approach he does!

  • @luciusirving5926
    @luciusirving5926 5 років тому

    Still helpful for an old video and this is better than all the math videos from 2006 and 2007.

  • @theholywand11
    @theholywand11 13 років тому

    The funnest thing is i'm in pre-algebra and now i know and can look into the future :]

  • @hai2410
    @hai2410 15 років тому

    My favourite of all your videos so far. very well explained indeed

  • @MrOscher
    @MrOscher 12 років тому

    Awesome video, very clear understanding at the end of it's ten minutes. Audio quality was superb.

  • @sahilcharniya7622
    @sahilcharniya7622 11 років тому +3

    really great introduction :)

  • @invisiblebutterfly6
    @invisiblebutterfly6 12 років тому

    What if you put the plane completely vertical and in the centre of the cone? Is the result of that an absolute value graph...or am I just confusing myself now?
    Nice video btw! :)

  • @rina.bella94
    @rina.bella94 13 років тому +1

    @weurRTG Thanks, I'm 17, in Quebec we learn this in the equivalent of I don't know how it works, somewhere in high school maybe, and it think it's really hard.

  • @theideacove1
    @theideacove1 4 роки тому +1

    subtitled in 21 different languges. wow good job 👍

  • @paulasarmiento9449
    @paulasarmiento9449 5 років тому

    i learn more from this channel than i do from my school teacher

  • @JohnnyJohn12503
    @JohnnyJohn12503 11 років тому

    Im currently learning this through BYU. this is much better

  • @dianedavidson5283
    @dianedavidson5283 4 роки тому +2

    Yes, there really ought to be a cool 3D software that shows all this more clearly.

  • @ace1cx3
    @ace1cx3 13 років тому

    Thank you!!!!! Now that I have watched your videos I understand all of it!!!! I use your website too. :D

  • @Jtking3000
    @Jtking3000 15 років тому +2

    well you learn something new everyday :)

  • @waqas902
    @waqas902 12 років тому +1

    thank you

  • @protoname_
    @protoname_ 12 років тому +1

    Thanks for the idea!

  • @imishan100
    @imishan100 11 років тому +1

    Thanks keep up the good work sir

  • @orchidscion
    @orchidscion 5 років тому +5

    Now I'm less likely to fail my test. I literally made a 0 on a quiz to to a lack of understanding

  • @TheAnaisP
    @TheAnaisP 11 років тому +5

    4:20
    smiley face :)

  • @jeevanadithya743
    @jeevanadithya743 4 роки тому

    Sir I like your video the way u do explain and make us understand, as a student I want to give you an suggestion please don't take it other way sir I thik your videos could be more clearly understandable if you add animations to it to explain concepts like conic sections and it would be ease for u too also to explain.😊

  • @weurRTG
    @weurRTG 13 років тому

    @SOLOVEFUCKINGmuz Algebra II is usually taught at age 15, or 10th grade. However, I've seen 11th grade students take the course, and I've even seen 8th graders take the course.
    I took it as a 9th grade student.

  • @bninjabninja
    @bninjabninja 13 років тому

    Check this out! This video has a Download button in the description !!!

  • @karimkhan1312
    @karimkhan1312 10 років тому +2

    thank u sir for excellent lecture

  • @PolyFranchesco
    @PolyFranchesco 6 років тому

    "you don't do this in your algebra 2 class"
    I am actually using this video for a project in my algebra 2 class where we are doing exactly what you said we shouldn't XD

  • @rajuthoppil3393
    @rajuthoppil3393 3 роки тому

    Awsm teaching

  • @Jakers2009
    @Jakers2009 15 років тому

    Thats so true, but i still understand it all... once the jargon is outta the way..

  • @MiaVilleneuve
    @MiaVilleneuve 5 місяців тому +1

    2:15 anyone see the smiley face :0)

  • @trecool212
    @trecool212 12 років тому

    The line and point are both conic sections as well, yes?

  • @pongman
    @pongman 15 років тому

    Oh and one other thing, maybe you can use Google SketchUp it's a 3-D tool that's free.
    Kind regards,
    pongman

  • @cinquain0
    @cinquain0 6 років тому

    That video was amazing! Great job Sal

  • @asherjunaid7847
    @asherjunaid7847 8 років тому

    pioneering e learning!

  • @beeayyee9977
    @beeayyee9977 6 років тому +1

    Write down an outline for your video, will help with guessing what to explain next.

  • @Irades
    @Irades Рік тому

    Thank you :)

  • @pami7160
    @pami7160 3 роки тому

    12 years ago but I need this experience now

  • @shatilachowdhury5321
    @shatilachowdhury5321 6 років тому

    Thank you for this video. I am taking precalculus in college. It really helps. Thanks again, Sal Khan, Khan Academy

  • @denibarondo9277
    @denibarondo9277 6 років тому

    I like your humor khan academy :))

  • @kennethdadedzi3796
    @kennethdadedzi3796 11 років тому

    Great introduction

  • @Mammothgravitybattles
    @Mammothgravitybattles 9 років тому

    Very cool, orbits are great.

  • @theweirdosyeah
    @theweirdosyeah 12 років тому +6

    Haha, 4:17 there's a smily face :)

  • @arkappa-t
    @arkappa-t 8 місяців тому

    Reviewing conics for central force :3

  • @rina.bella94
    @rina.bella94 13 років тому

    just wondering in what year of studies do we learn that, the age I mean, trying to compare with quebec.

  • @lanaashraf5106
    @lanaashraf5106 5 років тому

    The parabola should've been drawn as a line in the planar view, not a curve, since the plan you're cutting with is perpendicular to the plan view.

  • @aneeshaph5007
    @aneeshaph5007 3 роки тому

    Thankyou

  • @getsurasengan
    @getsurasengan 13 років тому

    I learned alot

  • @orangegold1
    @orangegold1 14 років тому

    So is a point a conics section... if your plane is horizontal right in the point that the two tips of the cones meet?

  • @DefaultGray
    @DefaultGray 9 років тому +10

    Smiley face!

    • @PAWNB3YOND
      @PAWNB3YOND 4 роки тому +1

      Yelling facial expressions is not how facial expressions work

  • @wesleyondisdike9647
    @wesleyondisdike9647 4 роки тому +1

    Wow, this was before khan academy was even a thing, this was the beginnings when sal was alone, ig that's why the software and video quality is low

  • @MrShasheem123
    @MrShasheem123 12 років тому +1

    Exercise in 3-d drawing!! :D XD

  • @dreaming_of_that_mbbs_mbchb
    @dreaming_of_that_mbbs_mbchb 10 років тому +3

    Can u link previous videos please also using all maths on khan webpage how long is that going to take as takeb 5 days and only learnt 20 skills

  • @BlackOpsIsTheBest
    @BlackOpsIsTheBest 11 років тому

    Everyone from Teague and Anderson, this is pretty good stuff! Better hope we don't end up chasing this down with 8 sections of notes though. XD Have a great day everyone!
    #p.4 teauge? nah #'s too lame
    Baylife

  • @utberoxsobad
    @utberoxsobad 13 років тому

    Ok I'm just thinking isn't a parabola and a hyperbola kind of impossible because if the cone goes on forever then you can't actually create that cut that they have right because they would just form an ellipse right? If someone can enlighten me so it actually makes sense or else I think we are doing this whole thing wrong right?

  • @Ghaiyst
    @Ghaiyst 13 років тому

    That's beautiful! It's sad that most math teachers in high school are too exhausted and the students themselves are too lazy to emphasize the beauty of mathematical concepts. I wish I knew this before so that i could have truely understood conics and be able to pass the tests. Instead, my math teacher was nice enough in 11th grade to drop this test and signed me up for AP calculus AB for the next year. Well, now that I'm a freshman in college calculus 2 leveled,Iwishiknewthisearlier

  • @waterlily716
    @waterlily716 15 років тому +6

    is an ebola a conic section? hee hee
    ah thanks for this video. good old algebra two :)

  • @divyasharma6389
    @divyasharma6389 12 років тому

    thnx good explanation

  • @pyrojayxx1366
    @pyrojayxx1366 4 роки тому

    I love you sir.

  • @itismetaphorical1016
    @itismetaphorical1016 8 років тому +2

    you sound more like Khanic sections !😂

  • @VideoOfMike
    @VideoOfMike 15 років тому

    The canadian/british education system just skip few stuff because the math class in combined, instead of having geometry,algebra... we only have one class where we are suppose to learn as much as content from both courses in the same time.
    The text books contains content (but it still skipped geometry). The teacher/school just doesn't teach it or leave it until higher levels.
    We learn probability/statistic in grade 12 and we will never learn things like conic, inequality & algebra longdivision

  • @amadodiego88
    @amadodiego88 12 років тому +1

    2:14 happy face

  • @shastacon45
    @shastacon45 7 років тому +2

    jajajj you drew a smiley face

  • @davidgraham8202
    @davidgraham8202 12 років тому

    " A Parabola is what happen when one side of an ellipse POPS OPEN! " :D

  • @DeSanctist
    @DeSanctist 12 років тому

    yeah, correct! us too.

  • @netraraman4532
    @netraraman4532 9 років тому

    Sir I have a question: wasn't that parabola one intersecting the above cone (the one which was parallel ) so won't it will actually become a hyperbola?

    • @samgaines2337
      @samgaines2337 8 років тому +1

      +Netra raman You're just viewing it wrong. If it's parallel, it will never cross.

  • @chinsunlee
    @chinsunlee 13 років тому

    wish me luck in my exam later

  • @j2ultimatefan
    @j2ultimatefan 11 років тому

    when he started the 3D drawing I kept moving my head right and left without even noticing lol XD

    • @shellssoul
      @shellssoul 5 років тому

      @Lady Oscar lol GOD BLESS ❤️✨😂🙏🏽

  • @bluerose83092
    @bluerose83092 11 років тому

    studying for my upcoming midterm and then my final...i hope i do well! :/

    • @flidict-8490
      @flidict-8490 5 років тому

      bluerose83092 well...did you do well?