Basic geometry: language and labels | Introduction to Euclidean geometry | Geometry | Khan Academy

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Before learning any new concept (mathematical or otherwise), it's important we learn and use a common language and label concepts consistently.
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Geometry on Khan Academy: We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of these shapes, how we define them, and what they teach us about the world at large--from math to architecture to biology to astronomy (and everything in between). Learning geometry is about more than just taking your medicine ("It's good for you!"), it's at the core of everything that exists--including you. Having said all that, some of the specific topics we'll cover include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions. Wow. That's a lot. To summarize: it's difficult to imagine any area of math that is more widely used than geometry.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
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hollyraeanne love it so do i

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Yeah me to and check out math antics too

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[@keeblerelmcookies]

I'm doing geometry now in high school. Failing badly , nothing like this video whatsoever. I blame common core nys for making everything so confusing.

[@keeblerelmcookies]

+Stephanie R. failed with a 14 at the end of the year lol

[@jonic211]

I'm in 5th grade for mark train and they have calculus and geometry and algebra so ya..... And science don't get me started

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+keeblerelmcookies I'm in 6th grade, you all some stupid crap.

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+Jamoliddin Salamov Damn

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+Jack Perloff I do all this stuff.

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this guy is brilliant

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Rodolfo Mora i hate math what math stands for MENTAL ABUSE TO HUMANS totally abuse!

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Rodolfo Mora ikr he really knows what he is talking about

[@netriosilver]

you must have had a bad teacher

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Park Jungkook i hope no geeks will come and get offended

[@jennhamilton8091]

This guy is just playing connect the dots

[@mylacrawford337]

Watching this 8 years later 🙂✊🏼

[@Plutoniummatt]

I'd have preferred armadillo

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LOL

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lmao

[@thelyricalpraphet1779]

Forreal

[@castboy88]

6:19 always makes me laugh. However you are still awesome, these videos always help before a big test :D

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DiSeAsE1o1 yup ikr ttyl

[@pamelawright1888]

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you know a uh uh uh uh a uh uh a STICK

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uh uh uh uh uh uh uh stick

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What's so funny about this

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Guys to those who think Khan's vids don't help. They do. You just need to actually concentrate on the words khan say. Turn subtitles on they help A LOT

[@pamelawright1888]

Pin-o-mile really convincing 😀😇🤗

[@PasscodeAdvance]

Thank you, also is your profile pic from K On? Kyoto Animation, I hope everyone there is fine

[@jennhamilton8091]

No they really dont

[@sycadelic666]

This just refreshed everything I learned about geometry in Grade School. Crazy what you can get down in a 13 minute KZbin video...

[@myrobotisgas]

My teacher gives a new concept everyday and expects people to understand. In 45 minutes it’s not enough time to learn completely in a class but thanks to this guy I’m able to learn concepts so thank you

[@williamcompitello9493]

I'm serious on going to college for construction. Geometry will help a ton! This is wholesome info here.

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William Compitello told ya he really knows what he is talking about to these unbelievable people

[@bestplayerofalltime105]

how did it go?

[@AnaLeeBR]

thank you so much for this, it's legitimately so helpful to have a video going over basic concepts like these that doesn't condescend to the viewer or automatically assume they are a child

[@SGTLeafyGreens]

ive been in Honors Geometry in 9th grade for about 2 months now and ive learned more from you then i have from my own teacher. thanks man

[@clodgozon3968]

The world of science is fascinating. Imagine the world 300 years back then where the society only starts developing and yet, some of the brightest minds invented these formulas that even now, are still useful in our modern world. They are so powerful that revolutionized the world. I love where this is going. Never going to stop learning even after college.

[@ruchimukhoty1584]

Khan academy makes maths a fun learning paradise. I have a maths olympiad after some days and thats when I found khan academy. I have learnt perimeter from here as well. Thank u so much for ur efforts for making such amazing educational videos😊

[@junior098123]

This guy can actually make math fun, for someone like me taking geometry as a froshman I feel this can ease that first year of high school tension. 10/10 my friend.

[@747Sean]

1:53 We could have called this an armadillo 😂 I died from laughing Also me: I'm not dead if you don’t get puns

[@bobaktadjalli6516]

After 9 years, still great, helpful and understandable. Thank you so much for teaching and sharing this video.

[@chanceearles9527]

I started 7th grade and I was very confused about everything, now after watching these videos I feel a hundred times more confident, thank you for making such great videos 😁.

[@trace4483]

u in 11th grade now?

[@chanceearles9527]

@@trace4483 lol yes

[@JadetheQuokka]

@@chanceearles9527 Same!

[@theleftistvortex]

@@chanceearles9527 Good luck in 12th grade!

[@chanceearles9527]

@@theleftistvortex thank you!

[@liquidmiilk7764]

0:04 Some of the, Sum of the, SUMM OV THI.!!!

[@JennyOwnzable]

I LOVE your videos! They are so much help & really teach me like none of my teachers ever could! Thank you!

[@zachbubbleswhodoesnotsigno7883]

Thank you for this video. Pass my test bc of it

[@brutal5230]

I think its sad when I see people criticizing others for thinking geometry is hard. All the different classes Ive taken on geometry have had different ways of teaching it, some much harder than others. Stop putting others down just cause they didnt find geometry as easy as you, the teacher makes the biggest difference.

[@sherpyyy6483]

I love this I stopped for a year because my parents didn't had any money at the time so in a few months I'm starting grade 9 and I wanted to know what are the basics so that I won't fall behind this was really helpful! thank you

[@chestersteentalksmukbangsa1558]

Love Khan and love how you used the different colors. The only problem is the size of the writings and orders of the notes. Some people may like to pause and look over notes.

[@anastasiatruex5072]

This is perfect! I love how he explained each step thumbs up!!! 👍🏻❤️

[@jacobdelapena5919]

For some reason i wasn’t taught geometry in high school and now i’m trying to learn through these videos in order to pass my college entrance exams 😭

[@nexsusarchon5358]

he just summed up reality with lines and arrows. *Mind Blow*

[@jennhamilton8091]

Yup

[@somebodyimportant3490]

My math teacher is on the geometry unit. He doesn't teach us the material and he just gives us a ton of work. This video helped a lot.

[@geckodoesgames8562]

Yeah my teacher dosent really teach us he just reads off the board. So im waatching this.

[@saskiajankie9419]

@@geckodoesgames8562 my teacher explains and draws everything.

[@abdelmajedmuktar3015]

Such a great video to watch not just to learn math, but also to have fun. I really enjoyed watching your course about geometry.👍👍🙏🏼

[@mathewthomas6694]

watching this in 2021 bc of online classes, I have now uncovered the holy grail of math vids, thank you khan academy

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Khan Academy really really helps me. It's so descriptive and easy to use. Just a click to KZbin and you're here :D I support all the people who made Khan academy possible

[@mahithbandi3006]

you are the best you take some of the most complicated things and breaking down and help other understand it so easily. Thank you so much.

[@Cinnamon_Chayne]

I was overwhelmed with tears listing to this. I feel squared away ;p

[@aliboss4471]

6:19 😂😂😂😂 still awesome vid helpful too 👏👏👏👏

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Yaaas I needed someone to comment this UhuhhUHhuH

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THIS HELPED ME SOOOO MUCH MY TEACHER IS SO BORING AND SLOW HE EXPECTS US TO UNDERSTAND THAAANKKK YOUUUUU

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[@intellectualshutin]

I apoligize for being completely irrelevant, but I was wondering what kind of program you used when you draw all these diagrams? They're really informative, by the way :) They've helped me SO much! :)

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I love this academy! Much appreciate for Mr. Khan

[@yourboychris1074]

6:19

[@Snowifawn]

*"I Think its a line segment even- you know UH-UH-UH-UH-UH-UH-UH-A stick of some sort...."* Made my Day XD

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he sounds like president obama

[@Snowifawn]

HaTTy HaTTingTon *does in Obama voice* Not Bad.

[@andrewb1830]

ERROR, STATEMENT FAILED TO LOAD

[@thezazziebin3336]

0:04 some of the SOME OF THE *S* *O* *M* *E* *O* *F* *T* *H* *E*

[@addy7318]

Wow.....I feel like I just looked this up on KZbin and then you all of a sudden post a vid! Crazy but so helpful!

[@madelaynevanoni7763]

Sal, thank you sooo much! Makes it alt easier

[@isaiahstrong4716]

watching these vids help me prepare for the next grade

[@unlistedcringe]

hey its me in 2020 even tho this video was created in 2012 i still love it its a relaxing geometry video! five stars boiiiiiiiiiiiiiiiii

[@hugojuan23]

muy buen tutorial de Geometria Basica, muy didactico para el aprendizaje deberia existir tambien en español

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hugojuan23 ya!aaaaaaaa

[@josephinetawhai7984]

All my life, I've never studied Geometry; not even in high school. In nz for me, every math study was different. So that's why I want to understand Geometry more and hope I can learn fast.

[@salvulcano9061]

ACT math making me watch the entire geometry playlist the night before. I gotta take the test at 8 am…. ON A SATURDAY!!!

[@hongweiguo970]

i am eight years old and i am going to year four next year and I want to lear geomitrey and I think khan academy is great！！！！！

[@alextarver4324]

I’ve always loved KhanAcademy I always used it at school

[@jcovik5357]

It's always interesting how old is video after watching it on Khan Academy.

[@lydiathornton7914]

This is the first time I ever understood geometry and I am 50!. I wish I had you for a math teacher when I was in school. Lol lol 😂

[@zaeemshoaib1007]

This helped me a lot when we were learning this

[@keiyuu7107]

thank you for this video, it will help me a lot

[@user-mv3ng9rj2l]

Thank you very much Sir Khan! These types of information are truly important, at least for me.

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Ty for this it helped me so much. Im totally subscribing

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This video helped my daughter a lot

[@SC-kp3qs]

I love love love his handwriting!!!!

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Every video of Khan Academy was very helpful. Thank you so much!!!!!!

[@digitallearningsolutions7118]

Geometry is definitely one of those areas that gets all of us confused at times. Has anyone had problems with Pythagoras Theorem calculations?

[@LastApe]

At school I am failing geometry at the moment because my teacher does not know how to teach !

[@destielsimpala7738]

Just started doing Geometry at school yesterday this is gonna help a lot!

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start having sex as it helps watch a porn

[@ilestip]

Thank you for the awesome explanation.

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U HELP ME SO MUCH SIR!!!

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9:05 THIS IS SPARTAAAAAAAA 😂😂

[@dianegonzales5587]

This really helped!

[@LudwigSpiegel]

Very nice! To the point!

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00:01 some of the, some of the, some of the characters... that beginning is hilarious!

[@AmadaraJourney]

#YouCanLearnAnything #YouCanLearnAnything #YouCanLearnAnything

[@sherisheepsworth8432]

I beg to differ

[@j4hamster]

your videos have saved my life. If it wernt for them I would have failed my geometry exam.

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This video help me a lot.

[@vallano8970]

Wanted to be prepared for 10th grade so thank you for this

[@matthewtaylor6845]

khan academy helped me pass algebra 1. thankss

[@rdg4002]

so helpfull man im a freshman in geometry can u imagine how hard it is but just the 4th day of school thanks for this explination guys if you havent already hit the like button and sub

[@sharoonhoney1054]

Very useful for basics😊

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khan academy help me pass the test that i am worried about it but it did it thanks to khan academy

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i LOVE khan academy it helps my f to a+

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Khan Academy helps me learn so much!😃😍👍

[@sharoonhoney1054]

Fabulous demonstration 😊

[@KrispyKrabby]

Thank you Hanzo! I appreciate your knowledge!

[@Chocbrowniesfoo]

Simple geometry.

[@vsause4science620]

TheCreativeGamer yeah

[@Theveszelboy]

I am doing math for fun on a Saturday afternoon. I just wanna get ahead in math cause I am extremely confused sometimes. We’re not in geometry yet, just jumpin’ ahead just in case.

[@Shaunhydemma]

I have to say that I understood a lot of this video but I can't compare it to my work!!! UUUUUUUUGH It sounded so informative but then I looked at my paper and my mind went blank!

[@mnsh6313]

1:55 I love how he is trying to make a point!

[@ptato3010]

No.

[@xxTNB4Cxx]

What program do you use to draw these diagrams? I love these videos!!!

[@orponkhandakar8015]

Thanks for help in my exam

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It is a good idea thank you 😊

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Thanks you so much!!

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Thanks10000 times🌻

[@aheroicandwell-reviewedliz801]

khan is my new teacher

[@robinfan1488]

The surface of the monitor that we are looking at is technically not 2-D but actually 3-D instead

[@clodgozon3968]

in virtual space calculated by math formulas, yes. the actual screen monitor, very flat.

[@genwords1789]

Thank You.🤗

[@robloxvibes2445]

Perfect I am studying for a test

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This is good learning

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I am in a relieve because I can get good scores because of this learning recouse.

[@treshunnorman1831]

I am learning about geometry now at school

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Khan academy makes math really boring but they make learning math a lot easier

[@makaylabreanne]

First day of school and I already have a pre math test tomorrow. Does it count? I have no clue! So this is how I'm spending my evening.

[@ManisbyHeather]

I have never been any good at math and it doesn’t matter what I watch and how many good things I see I still cannot seem to get it. :( I wish I could hire a free tutor to teach me how to do this. :(

[@wdup01]

The first month of my sophmore geometry class explained in 13 minutes. Alright

[@trejo3768]

thank you, so much.

[@MrUtubelarry]

i love this guy

[@paul1964uk]

Will you be introducing 'vectors' as directed line segments in this playlist I wonder? It's always good to have more than one way of looking at the same things, so beginning to think about 'space' without reliance on a prior coordinate scheme could be achieved by bringing forward vectors (so before going on to Cartesian stuff)

[@theresaroachonyourscreen2y770]

@@eajazahmed8554 i wonder what happened now...