How to draw a regular octagon knowing the length of one side

Рет қаралды 724,332

8 жыл бұрын

How to construct a regular 8-sided polygon given the measurement of one side.
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This KZfaq channel is dedicated to teaching people how to improve their technical drawing skills. It focusses on drawing figures from the geometric plane to descriptive geometry and also different systems of technical drawing representation.
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Dubbed by Frank Shaw.
Music by Antonio Fernández Ruiz. antoniofernandez.es/
#Geometry #HowtoDraw

Пікірлер: 130

@williamowens3905 Жыл бұрын

I needed an octagon for making a finial for the turret of my house. Precision is the key. Thanks so much!

@hemlaprasad643 6 жыл бұрын

Thanks a lot helped me in my basic technology test

@astro_penguin_ 3 жыл бұрын

It's not regular. I got 7 correct sides and 8th side is far too short. Noticed a lot of people had the same problem. And I did do everything properly.

@akhilakhi3218 2 жыл бұрын

Draw that from another side 👍

@suminazar1387 Жыл бұрын

Mee too

@HarshG28 Жыл бұрын

@@akhilakhi3218 tried that too

@anthonypaul3609 4 жыл бұрын

All your videos helps alot

@kevingarner1558 5 жыл бұрын

Thanks, I learned a lot.

@neoxanimator6579 6 жыл бұрын

Thank you man!

@evaperez7668 4 жыл бұрын

omg thank uu soo much Arthur!!

@anikawessels9714 3 жыл бұрын

I saw the intro and drew it and was like ohh oops

@riyachauhanriyachauhan3567 3 жыл бұрын

Same thing with me 😁😁

@cyber_bones1298 2 жыл бұрын

yeah me too🤣😅

@ashishrajput23 2 жыл бұрын

@troubiga 2 жыл бұрын

😭 😭 😭 😭 intro got me 2

@hutumschool2737 5 жыл бұрын

Easy to understand 🖒

@chandandey5770 5 жыл бұрын

Love u...bro...thank u for help us ........

@ANIRUDHJAGANATHANBME 5 жыл бұрын

This helped me so much. Thanks a lot

@sheikyassim4944 6 жыл бұрын

This video helped alot man!!!! Thank you

@sheikyassim4944 6 жыл бұрын

Hey Aurther thanks and I like you because you well and explain How to construct these

@pritamreacted5962 4 жыл бұрын

very helpful video .................. thanks man.......

@meenumehta874 4 жыл бұрын

It solved my problem....... thanks a lot

@sunnahwear7540 3 жыл бұрын

Anyone else gettting up to the part where u cut the circumference at 7 points but the last point dosent overlap A? And yes I have checked over all calculations multiple times

@victoroc7317 4 жыл бұрын

thanks i enjoyed the video it really helped am greatful

@iatemyhand11 4 жыл бұрын

Thanks for the video, i like it

@mic4059 6 жыл бұрын

This helped SO much. Thank You Arthur!!

@preasadpreasad4436 4 жыл бұрын

Hii

@Eggzzzo 4 жыл бұрын

@Braycali 5 жыл бұрын

Thank you.

@za_opticzz2447 3 жыл бұрын

Bro you are a g this has helped me so much ty

@magdalenazumbira-zf4nq Жыл бұрын

This will really help me alot

@probablynothung8135 2 жыл бұрын

Good for a beginner. All u have to do is be creative.

@thiengen3426 5 жыл бұрын

Thanks a lot

@a10cgaming67 5 жыл бұрын

Octagon has 8 amazing sides and 8 fantastic angles

@cc12yt 4 жыл бұрын

oh.... *stop.*

@sandippandit8256 5 жыл бұрын

Thank you

@sandippandit8256 5 жыл бұрын

Octagon basic test helps.... Thank

@yeshuakebede 2 жыл бұрын

Bruh thank you so much!

@murthacharihkmurthyhk5075 4 жыл бұрын

Thanks sir best video

@ivantv7572 2 жыл бұрын

THANK YOU

@basilebannister710 6 жыл бұрын

Thanks so much for this great video it helped me so much

@utsabsenchury5152 6 жыл бұрын

good

@voidstiles9654 3 жыл бұрын

Yh it help me a lot thanks so much

@AmanDeep-hp6pf 4 жыл бұрын

thanks a lot

@almirkaqiu3776 5 жыл бұрын

Thank you so much it helpt me with my math you are a genius

@theresescicluna1601 4 жыл бұрын

ITS the best vedeo if u want to learn

@officialwarren825 Жыл бұрын

Thanks you

@shakeelmuhammad7192 4 жыл бұрын

Excellent 👍, but little difficult for basic learner and beginner. But it's excellent 😊

@ashleybarnes6362 4 жыл бұрын

Thanks lad

@hMpP32 5 жыл бұрын

beautiful

@iatemyhand11 4 жыл бұрын

Yeah, you're right. beautiful artwork of the octagon

@valentin5403 5 жыл бұрын

Something very important is missing here . Without it the above description is simply a recipe for constructing a regular octagon.

@harryinhuahin1272 2 жыл бұрын

"...the above description is simply a recipe for constructing a regular octagon." What else did you expect...?

@valentin5403 2 жыл бұрын

@@harryinhuahin1272 the proof

@meenudas25 Жыл бұрын

Thankyou 🥰🥰

@G_Silent 2 жыл бұрын

Amazing never knew you could do this!

@satrickptar6265 5 жыл бұрын

Watching every polygons because they will appear on the test in no time

@everythinginonevines443 4 жыл бұрын

Thanks sir

@akashsharma7253 4 жыл бұрын

Nice video sir

@ericaanglin262 Жыл бұрын

I was hoping you could help me with some measurements. I want to make a 70 foot octagon that is divided equally by 24 inches across it's length, but need to calculate the individual lengths across the Octagon. I hope I've said that so you understand what I mean.

@LockeAnimations Жыл бұрын

chatgpt dude

@randallbegay9162 11 ай бұрын

Will it work for laying out a string line on Navajo hogan house ? Does dirt ground has to be flat level for this to work ?

@achintyadwivedi1507 3 жыл бұрын

Thanks a lot It just took 5 minutes to draw a single shape..

@suryateja4855 5 жыл бұрын

How did you reduce the length to 3.40 cm?

@zainabibrahim2889 2 жыл бұрын

Wonderful v6

@YTShuaib 5 жыл бұрын

Thank you very much :)

@iatemyhand11 4 жыл бұрын

Yeah, thank you very much

@jigssscupid8836 5 жыл бұрын

Why scribe arcs N &O and why bisect line A B???

@anuragpatil2338 4 жыл бұрын

Why people unlike this?

@claudiaosorio9605 3 жыл бұрын

If I only have an x circumference, how do I find the given measure to find the a b distance? Basically how do I divide any circumference to create a perfect octagon from it?

@ArthurGeometry 3 жыл бұрын

Try with this video: kzfaq.info/get/bejne/bb9iocqolbu0n2w.html

@subhodipdas3723 5 жыл бұрын

What is the method name sir?

@samiegapeters2503 Жыл бұрын

Spot on, thanks

@user-pz2fe7en7c 2 жыл бұрын

Kindly show how to draw ovtogonal patals.

@kukukemokemo5279 3 жыл бұрын

جميل جداً

@AswajithBabuAswajithBabu 5 жыл бұрын

Why is that I got same result in both methods, this and by the method of taking angle 135..? Same result in the sense, 7 sides are of required length and one side is short of the required length.. I tired drawing for 5 cm

@DarkDevils2003 5 жыл бұрын

Do manage to solve it? I also get the last side to be slightly shorter.

@valkeitos 3 жыл бұрын

Cut section in EGD is a nightmare 🙇🏻‍♂️

@shortclips4085 9 ай бұрын

Which method is this ??

@pineappleprincess9704 3 жыл бұрын

An octagon is a shape with 8 sides, right?

@ArthurGeometry 3 жыл бұрын

Yes, It is

@fergusb2440 3 ай бұрын

Radiuses? Or perhaps more appropriately, Radii?

@zagmek 2 жыл бұрын

This was awesome for cutting some cardboard into an octagon to disguise an xmas white elephant gift! Everyone is going to think it's a stop sign!

@Dunc2222 2 жыл бұрын

This is interesting, and I suppose may be useful if you only need to draw an octagon. But it would be much more helpful and educational if you provided some explanation of the principles that are behind this geometry. As it is, it feels like a superficial solution.

@rashisharma8389 2 жыл бұрын

Thx you help me in cheating in exams 😂😂

@suryateja4855 5 жыл бұрын

Please mention it clearly .... How much you have taken the length...

@2-_ 4 жыл бұрын

How, Elmo, how‽

@LeClusterFunk 4 жыл бұрын

Totally forgot to bring an octagon!

@pamkaur17 5 жыл бұрын

@dkgaming9467 2 жыл бұрын

Thanks for the video I prepared for exam

@valentin5403 2 жыл бұрын

The ancient Greeks did not leave us just recipes. They left us the method of making proofs to any math problem. That's how I was thought to do geometry problems. First you show the proof (why point O is the center of circle and so on) then you display the construction. Logics originated in Greece only and later combined with Galileo experiments led to the scientific method. As such the scientific method is the crown achievement of the Western civilization.

@Jjsticks._. 4 жыл бұрын

WHERE IS JACK BLACK

@TheHirou 2 ай бұрын

If your octagon looks like shit try this method instead, that honestly, works better: -Draw a square. -Divide that square into 4 squares, you can get the center point by getting the mediatrix using two of the sides. -Draw an X that connects all 4 corner of the square. -In the point marked by the X (The square center) draw a circle whose radius is half the entire square. -The points in the circle that intersect with the X are the different corners of the octagon, draw a line in between them.

@radekutherknapcok5409 6 жыл бұрын

I study math and I really like your videos, however sometimes I would really appreciate some more detailed info, as I am a person who want to know what is hidden behind "this magic" and how things really work. If you have some webpages or videos where you speak about proofs and so on please let me know.

@vutlharhimahatlani8557 5 жыл бұрын

I can’t get it right

@portaobellomushroom9198 4 жыл бұрын

Mood

@diptikar9367 Жыл бұрын

This helped me for exam a lot

@carlkundan8178 3 жыл бұрын

im getting so comufes

@jotgill8481 Жыл бұрын

Nice 😋

@surajmahto9690 5 жыл бұрын

Pentagon please give me

@RJ-vs5pt Жыл бұрын

Thnx a lot sir

@posttenebraslux7571 Жыл бұрын

Watching the person drawing that on a computer is frustrating, I watched another video with a man drawing an octagon the normal way, by hand, accurate measurements, that was very satisfying for me.

@lynnyac5664 10 ай бұрын

I made one mistake and ended up with a heptagon!

@nnodimojukwu5941 3 ай бұрын

Pls what is the length of L

@ArthurGeometry 3 ай бұрын

4cm.

@nnodimojukwu5941 3 ай бұрын

@@ArthurGeometry thanks alot

@fgtnpjln4833 4 жыл бұрын

Actagon

@mariaortega9611 4 жыл бұрын

That will take long

@alnomanrafiz5043 2 жыл бұрын

thanks

@luiginodilenardo6820 2 жыл бұрын

Guarda Miei disegni Sono misurati Riguardano area cerchio

@dhrubajyotidaityari9240 2 жыл бұрын

Beauty

@PeterTschappler 3 күн бұрын

Didn’t work, ended up with 9 1/2 sides after doing it perfectly

@mehmedmehmed4553 2 жыл бұрын

Vvv

@rob7290 4 жыл бұрын

Please get a pop filter for your microphone.

@harryinhuahin1272 2 жыл бұрын

If only we could also get filters for silly and/or arrogant comments... lol

@alfiyaalfiya4568 Жыл бұрын

I don't come this octagon

@colinaugustyn3 Жыл бұрын

I need to draw a octagon 4 cm per side this method does not work

@ArthurGeometry Жыл бұрын

Yes, it works

@colinaugustyn3 Жыл бұрын

Its a side short, is there a limit to how short the sides can be or no?

@legendddx16 3 жыл бұрын

lawra

@carlkundan8178 3 жыл бұрын

sssssssoooooooooo bad im getthing comu.. fffffff

@carlkundan8178 3 жыл бұрын

i dont like math

@eliasrodriguez895 2 жыл бұрын

The way yo you teaching is difficult. I only have seventh grade school never took geometric class, easy whay drew a circle then use compass to divide the space you teaching is difficult

@siennahenderson1812 7 жыл бұрын

that is stupid ness

@MustardPipeLibrary 7 жыл бұрын

If there is any way in which this could be said to be "stupid", it is in not including a proof with the construction (which doesn't seem to be the point of this video anyway). I'll go ahead and include one here: Draw a line from A to O, and draw a line from B to O. If these two lines form an angle of 45 degrees, then we have a regular octagon, since the triangle is isosceles, and a regular octagon can be constructed out of 8 isosceles triangles with angles of 67.5-67.5-45. The question is, is that angle 45 degrees? If we let the distance from A to M be 1, then the distance from M to N is 1, and the distance from N to O (which is just the distance from A to N) is sqrt(2). So the distance from M to O is 1+sqrt(2). So whatever the angle between the A-O line and the M-O line, the tangent of that angle must be 1/(1+sqrt(2)). Now we can use the half-angle identities that so many students forget (and that I, to be honest, needed to look up): sin(x/2)=sqrt((1-cos(x))/2), and cos(x/2)=sqrt((1+cos(x))/2), so tan(x/2)=sqrt((1-cos(x))/(1+cos(x))), or tan(x/2)=sqrt(1-cos(x)^2)/(1+cos(x)), which (since sin(x)^2+cos(x)^2=1) means tan(x/2)=sin(x)/(1+cos(x)). Taking x=45 degrees, we get tan(22.5)=(sqrt(2)/2)/(1+sqrt(2)/2), or 1/(1+sqrt(2)). This means the angle between A-O and M-O is 22.5 degrees, so by symmetry the angle between A-O and B-O is 45 degrees, and so we have a regular octagon. On an unrelated note, it would be funny for someone with a Ness avatar to show up and say "no it isnt".

@dylanlemon255 7 жыл бұрын

MustardPipeLibrary lol

@legendddx16 3 жыл бұрын

jhatu