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Similar triangles | Similarity | Geometry | Khan Academy 

Khan Academy
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Introduction to similar triangles
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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.
For free. For everyone. Forever. #YouCanLearnAnything
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22 авг 2024

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Комментарии : 355   
@khan-xr6jz
@khan-xr6jz 4 года назад
we out here in 2020 still confused on basic calculus
@allyhamilton1193
@allyhamilton1193 4 года назад
Gravyyy hahahahha
@hunterpetrovia9454
@hunterpetrovia9454 4 года назад
Bruh I'm doing this in online school for 9th grade
@sink9035
@sink9035 4 года назад
Synvc different lessons carry on with math
@user-si8vf9qe8b
@user-si8vf9qe8b 4 года назад
@@hunterpetrovia9454 me too
@ogsupremelyvida
@ogsupremelyvida 4 года назад
me lol
@obi-wankenobi4151
@obi-wankenobi4151 5 лет назад
The, Khan-cept of triangles
@phantaminum9734
@phantaminum9734 4 года назад
Hello There.
@dovesoap2076
@dovesoap2076 4 года назад
This implies that Obi-Wan has canonically taken geometry and struggled with it
@goowadeshravni2479
@goowadeshravni2479 4 года назад
NICE
@nayhvn
@nayhvn 3 года назад
Currently sobbing from this horrendous dad joke
@ingoflamingo1259
@ingoflamingo1259 3 года назад
Haha
@nazi_n2637
@nazi_n2637 2 года назад
When you realize that this is a video of the year you are born. It just kinda hits different ! Thank you Sal , I hope the next generation will also take the goods from you and Khan academy!
@AVABROOKEE
@AVABROOKEE 2 года назад
Same lol
@Onlooker490
@Onlooker490 Год назад
Yea same
@Cabravex
@Cabravex Год назад
same jajaja
@delev11
@delev11 Год назад
This video is literally older than me 💀
@catthebatflute
@catthebatflute 10 месяцев назад
@@delev11 Same. By an entire dang year.
@caseyedwards6452
@caseyedwards6452 11 лет назад
you explain everything so much easier than my teachers. thanks so much
@chiy9472
@chiy9472 3 года назад
hi
@ballerspro8310
@ballerspro8310 2 года назад
casey where you at now
@e6ypjeff2024
@e6ypjeff2024 10 месяцев назад
@@ballerspro8310where u at bro
@allisonliben2086
@allisonliben2086 5 месяцев назад
It’s 2024 💀
@peachyspalace
@peachyspalace 7 лет назад
WOAH TRI-ANGLES. I get it.... Sometimes it takes me a while to get these things.
@julli4821
@julli4821 7 лет назад
XD
@julli4821
@julli4821 7 лет назад
Same
@juliuscaesar635
@juliuscaesar635 6 лет назад
lol
@wtfisggon7251
@wtfisggon7251 6 лет назад
Lol you just made me realize. MIND-BLOW
@sanadima788
@sanadima788 5 лет назад
Mind blown bro
@ysfnvji
@ysfnvji 13 лет назад
"lets say.. we know.. i don't know.."
@kidzer9713
@kidzer9713 4 года назад
My mother passed this curse of not being able to do geometry on to me
@Magic_Fetus-zv8qv
@Magic_Fetus-zv8qv 3 года назад
Same
@nicario4716
@nicario4716 3 года назад
Literally the only thing I struggle with in math
@iancope6588
@iancope6588 7 лет назад
240p feelsgoodman
@zafarhan4878
@zafarhan4878 5 месяцев назад
Fr 💀
@theofficial-j-2859
@theofficial-j-2859 3 года назад
“Triagles..heh heh” -Khan academy guy 🤣
@pvpsaandopefresh
@pvpsaandopefresh 5 лет назад
Omg thank you so much. I just started college yesterday and totally forgot how to do this!
@1crida1
@1crida1 6 месяцев назад
Did you graduate yet?
@HitsugayaToushiro911
@HitsugayaToushiro911 12 лет назад
dude ur the fking AWESOMEST maths teacher ever i love u
@OSEAN_AIR_DEFENSE_FORCE
@OSEAN_AIR_DEFENSE_FORCE 3 года назад
It’s hard to believe this but you wrote this comment when I was 4 years old
@palarpachidvilas7477
@palarpachidvilas7477 3 года назад
@@OSEAN_AIR_DEFENSE_FORCE yes when I am six year old
@OSEAN_AIR_DEFENSE_FORCE
@OSEAN_AIR_DEFENSE_FORCE 3 года назад
@@palarpachidvilas7477 lol
@Gigadrax
@Gigadrax 11 лет назад
I looked this up to prepare for a Calculus test XD. I find it hilarious that the hardest part of calculus is all the basic multiplying and rules we've already been doing our whole lives.
@stevenjohnson3662
@stevenjohnson3662 6 лет назад
Gigadrax I'm trying to understand some deformation of a shape in an engineering course
@helix4267
@helix4267 3 года назад
Me whos learning this in geometry
@capnsteele3365
@capnsteele3365 3 года назад
@@helix4267 same
@buraktv90
@buraktv90 11 лет назад
That was a perfect flashback in to my school years. Thanks alot.
@backyardducklife5561
@backyardducklife5561 11 лет назад
My sub barley explained this to my class so some of us barley knew the material. but we watch your videos 24/7
@Asian5525
@Asian5525 12 лет назад
I forgot my book at home, and I had a test the next day! I couldn't study.... but then Khanacademy saved me! Thanks Khanacademy!
@sweetysureka1573
@sweetysureka1573 8 месяцев назад
How was your test?
@jackstephens7462
@jackstephens7462 4 года назад
I love spending Friday evenings watching some guy talk about triangles for 10 minutes... I’m exactly where I wanna be rn
@Worldwiderecorders
@Worldwiderecorders 13 лет назад
I would pay u 50 % of my yearly makings just for u to tutor me :P
@lovichy9828
@lovichy9828 3 года назад
@kanishk mehto I replied you after 3 weeks
@OfficialToxin
@OfficialToxin 3 года назад
@@lovichy9828 same
@scorp5820
@scorp5820 3 года назад
@@lovichy9828 I replied you after a month 😎
@CristianMartinez-cr7si
@CristianMartinez-cr7si 3 года назад
@Remya TG I replied to you after a month
@chiy9472
@chiy9472 3 года назад
@@CristianMartinez-cr7si I replied to you after 2 months
@shreyasnathala1489
@shreyasnathala1489 5 лет назад
This was put up on RU-vid on my birthday!!!!!!!!
@ProdigyMotivational
@ProdigyMotivational 4 года назад
happy birthday for yesterday then... Im in australia so maybe not yesterday for u
@eligga02
@eligga02 4 года назад
Bad Username Shreyas Vids no one cares
@nolimitchris1300
@nolimitchris1300 4 года назад
Elijah Haridas nobody cares about your comment either
@shreyasnathala1489
@shreyasnathala1489 4 года назад
NoLimitChris ya thx
@shreyasnathala1489
@shreyasnathala1489 4 года назад
Bad Username thxx
@Alex-bq9sc
@Alex-bq9sc 7 лет назад
Thank you so much! I am in 6TH Grade HI-CAP Math class, and we are going to take a test on this. OMG though, thank you SO much! I would have gotten an F if not for you... you earned my sub
@coconutyoongi5087
@coconutyoongi5087 7 лет назад
AliKat Gaming I KNOW RIGHT! IM A 7TH GRADER IN MATH PRE AP AND OMG IT HELPED THANK YOU KHAN ACADEMY lol
@emmajeanne1900
@emmajeanne1900 5 лет назад
12 years late *baby* WOOO
@soccer100ify
@soccer100ify 13 лет назад
your voice makes want to hug somebody. lol
@evanbrosky1489
@evanbrosky1489 3 года назад
lol
@unooasis565
@unooasis565 4 года назад
Why are the comments up here this is not floor gang
@hellerena4744
@hellerena4744 3 года назад
Can't wait to come back here when I'm in college where I forget basic geometry 🥰
@naveensundar4765
@naveensundar4765 4 года назад
The quality is insane
@ragtimecowboyjoe3321
@ragtimecowboyjoe3321 4 года назад
i love learning in 3fps
@god_mantis_gaming9390
@god_mantis_gaming9390 4 года назад
2020
@codm.inferno1202
@codm.inferno1202 5 лет назад
12 yrs late
@tvremotefoutainpen3995
@tvremotefoutainpen3995 4 года назад
Thank you for this video. My teacher has an accent so it’s hard to learn from her sometimes
@emmajeanne1900
@emmajeanne1900 5 лет назад
**writes triagles** him: no wait it’s triangles not triagles
@PinkGloom
@PinkGloom 15 лет назад
It all makes sense to me now!! I can't thank you enough
@pushpateja1189
@pushpateja1189 2 года назад
Bro before 12yrs u commented??😳
@creamysauce7966
@creamysauce7966 11 месяцев назад
That "Hello" legit gives me goosebumps lmao
@equestrianclub5881
@equestrianclub5881 6 лет назад
I still don’t understand
@ashlynogrady2794
@ashlynogrady2794 6 лет назад
same bro
@goldenfreddykiller
@goldenfreddykiller 4 года назад
Same here
@kdruar6442
@kdruar6442 3 года назад
slept through my zoom call. now i’m here. thanks for the lesson!
@CooVirgo01
@CooVirgo01 9 лет назад
This really helped! Thank You so much! :)
@aishakshu
@aishakshu 9 лет назад
Ahem.
@CooVirgo01
@CooVirgo01 9 лет назад
I know haha, I use Khan Academy too! :) Aishwarya Singh
@stupidmemes4u2see59
@stupidmemes4u2see59 2 года назад
I swear, this man is the messiah of math!
@kajollally
@kajollally 13 лет назад
thank you so much.
@anisaalija5744
@anisaalija5744 7 лет назад
Thank you soo much!
@notandrecolina6283
@notandrecolina6283 5 лет назад
2019
@GhostofFarta
@GhostofFarta 4 года назад
Original
@dampelps
@dampelps 15 лет назад
wow mean thank you so much for this video! you are more than great!
@Emwithastarr
@Emwithastarr Год назад
This video was posted before I was born. It’s still useful.
@GenericCoder
@GenericCoder 13 лет назад
@gyarin40 Its used alot in programming and real life application especially in space. You just have to search to find what its used in :). Plus its interesting concepts.
@synthwayve3969
@synthwayve3969 6 лет назад
Are you new? You seem to be fumbling with words and it's a little confusing. I recommend learning the topic and using this for revision.
@reubensingh4508
@reubensingh4508 6 лет назад
The WolfHowlxs He made this video is 2007. Watch one his new videos. Pure educational value!
@hannamoon6265
@hannamoon6265 11 лет назад
i came here cuz i JUST LIKE TRIANGLES
@noahramirez3882
@noahramirez3882 2 года назад
i swear this is my math teacher
@laneswift7190
@laneswift7190 8 лет назад
thank you soo much for this it helps me too...but the sound is quite less 😂😂😂 so kinda say loud ...but its really good ...I got soo much help by it 😃
@oliverbaltzer5990
@oliverbaltzer5990 9 лет назад
thx for helping me study khan academy!!
@stxrstruck3992
@stxrstruck3992 5 лет назад
2019? 😂😭
@biscuit6116
@biscuit6116 4 года назад
2020?
@naveensundar4765
@naveensundar4765 4 года назад
@@biscuit6116 ye
@flan.insana
@flan.insana 3 года назад
3481?
@MostafaAhmed-jp7oi
@MostafaAhmed-jp7oi 3 года назад
@@biscuit6116 2021????
@zensation22
@zensation22 3 года назад
nah 2021
@Elitea20
@Elitea20 7 лет назад
Thanks that help me get a good mark in my GCSE
@lordofchaos8975
@lordofchaos8975 5 лет назад
I never know you can get an exam in geese
@barcaedition9832
@barcaedition9832 5 лет назад
How tf did u have this in ur gcse i have it in year 9
@adityas.7193
@adityas.7193 2 года назад
I am just 2 months older than this video.........
@Kurosaka
@Kurosaka 5 лет назад
Anyone watching this in 2021?
@sunithachalla2166
@sunithachalla2166 4 года назад
People after 14 years of video 👇👇sry 12 maybe😁😁😁
@321runescapegod
@321runescapegod 12 лет назад
thank you i missed that lesson in class because i was sick and that made my homework make sense
@shirleyperez9473
@shirleyperez9473 5 лет назад
12 years!😲
@gayatrisarmah5011
@gayatrisarmah5011 6 лет назад
world best teacher...ever
@maria2706
@maria2706 15 лет назад
Hello :) A Im also theacher in maths , sorry for my bad english - but it is not aloud to write x and y for sides and angels in the first part :))) but is nice video, thanks!
@reversible8740
@reversible8740 5 лет назад
10 years late but yes, it is allowed, why would it not be?
@arpitavyas1156
@arpitavyas1156 10 лет назад
Gud 1 but how do v find angles from similar triangles
@SumRandumbUser
@SumRandumbUser 10 месяцев назад
It's been 9 years, did you ever find an answer?
@biscuit6116
@biscuit6116 4 года назад
you made this before I was born lol
@scorp5820
@scorp5820 3 года назад
Triagles
@palarpachidvilas7477
@palarpachidvilas7477 3 года назад
THE ONE WHO IS SEEING THIS VIDEO ANYONE THERE I AM 😁
@Weay.
@Weay. 8 лет назад
Thank you. You have helped me for my test tomorrow aka GA MileStones
@ysljalen7698
@ysljalen7698 8 лет назад
I took that too
@moarijwaqar7568
@moarijwaqar7568 5 лет назад
i am watching in 2019
@flan.insana
@flan.insana 3 года назад
i am watching in 2020
@authenticNL2
@authenticNL2 3 года назад
i am watching in 2021
@lalitapawar2364
@lalitapawar2364 4 года назад
Thanks sir
@penosia
@penosia Год назад
y no graphic ate bottom?
@resentfulglacier6540
@resentfulglacier6540 7 лет назад
thanks a lot helped me answer a few questions
@atr_12o6aousof5
@atr_12o6aousof5 3 года назад
it was useful thx Khan
@BabyPeanutbutter22
@BabyPeanutbutter22 15 лет назад
this vid is keeping me in leap!
@OSEAN_AIR_DEFENSE_FORCE
@OSEAN_AIR_DEFENSE_FORCE 3 года назад
Bruh I was 2 years old when you wrote this comment
@benask6067
@benask6067 3 года назад
helped a lot thanks
@nandita4578
@nandita4578 3 года назад
Khan Academy to the rescue.
@swanni1633
@swanni1633 5 лет назад
So basically if the angles of 2 shapes are the same on the corresponding side.Its similar Right?Thats the one thing?! please answer!!
@ZigSputnik
@ZigSputnik 5 лет назад
Yes, if all the internal angles of two shapes are the same then they are similar. If the lengths of the sides are also the same, then they are congruent.
@bobbylajeret5997
@bobbylajeret5997 5 лет назад
I LOVE KHAN ACADEMY
@therealjish7733
@therealjish7733 3 года назад
Nice 240p quality you Rockin there jk no hate thx helped a lot
@reenashah6040
@reenashah6040 8 лет назад
Thank you so much for this.
@aidanshere2577
@aidanshere2577 Год назад
This videos is older than me 💀
@A_Strawberry
@A_Strawberry 3 года назад
Thank you kind Indian man 🙏
@motionxd5984
@motionxd5984 4 года назад
Geez, this video was recorded the year I was born!
@mahirajput3796
@mahirajput3796 6 лет назад
Thanks
@avaselena6558
@avaselena6558 5 лет назад
My math tutor was supposed to come to my house today, but she canceled last minute. My test is tomorrow so yup life is GREAT!
@mazyonmohamed6536
@mazyonmohamed6536 4 года назад
Thnksteacher
@deathtrap200
@deathtrap200 12 лет назад
This is funny and cute! :)
@FredboySFM
@FredboySFM 4 года назад
good ol' sal Khan
@Johnsmiththesmite
@Johnsmiththesmite 9 лет назад
Thanks help
@dubeyd5384
@dubeyd5384 6 лет назад
How we choose two triangle I. e in which order from given figure
@itz_guaty3655
@itz_guaty3655 8 лет назад
man this was really helpful =]
@matteoscala6557
@matteoscala6557 4 года назад
I am not sure if the choice of numbers is the best possible for a first lesson :)
@leif1075
@leif1075 4 года назад
WHY do you say sides are corresponding when they are opposite the same angle instead of simply saying because they ARE PART of the same,angle..meaning it is the side or edge of the same,angle as in the other triangle just a different length..much more straightforward..just curious..
@jeroenpreder9785
@jeroenpreder9785 10 лет назад
A little bit confusing
@vrtoabushyan2532
@vrtoabushyan2532 6 лет назад
Deja Preder lol dat destiny profile pic
@Ruerexes
@Ruerexes 2 года назад
right
@yayaaziz156
@yayaaziz156 9 лет назад
Thx
@xlwaiyiplx
@xlwaiyiplx 15 лет назад
how spell similar?
@chogiwwwaa9322
@chogiwwwaa9322 5 лет назад
Similar
@4ktt.exclusive
@4ktt.exclusive 2 года назад
@@chogiwwwaa9322 10 years late lol I think they found out how to spell it…. Dang the days before Covid all I can think about
@katie5854
@katie5854 8 лет назад
does this apply to other shapes as well?????
@Artemis25
@Artemis25 8 лет назад
Yup
@rageking_1014
@rageking_1014 4 года назад
Khan anyone understand me?
@pushpateja1189
@pushpateja1189 2 года назад
Omg 14yrs🥶🥶🥶
@venugopal-ml3lh
@venugopal-ml3lh 8 лет назад
the words r not tat clear but helpful
@inayaway5099
@inayaway5099 4 года назад
are videos from 2006 really helping
@zafarhan4878
@zafarhan4878 5 месяцев назад
I'm watching a video that was posted 2 years before I was born 💀💀
@CanadianGolfer613
@CanadianGolfer613 10 лет назад
In the very first example could you also say the ratio: 7/5 = x/2
@harlemcasanova6406
@harlemcasanova6406 6 лет назад
Love it
@KraypayJR
@KraypayJR 8 лет назад
@xxhyperchocolate did you ever get your Samsung galaxy three years ago?
@sucaduushamohamuud5925
@sucaduushamohamuud5925 2 года назад
Iam watch 2022 in this time 14ago my age is 4year
@Rin-xy4tt
@Rin-xy4tt 8 лет назад
helpful
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