Rotation around a point

[@shoshanadubnow7017]

THis video saved my life the day before my math test

[@redxvortex9816]

Madam, you just made me pass a really important test

[@choseno2161]

RedxVortex madam 😂

[@btmavicks6059]

Thank you so much .... great strategy

[@oobert0731]

Simp

[@emily191]

@@oobert0731 you learn the word simp once and now u cant stop using it learn what it means first pls

[@toluo212]

@@emily191 I see you are a cultured individual

[@rahelfantaye6154]

This is just what i needed, I have been watching videos for about 3 hours to understand this and finally found this video . Thank you so much:)

[@salsabeelabudalou1244]

I am a teacher and I used your method to teach my students ,it’s amazing thank you so much you really helped me

[@shafiqosman4117]

you are the best teacher ever !!!!!!!!!!!!!!!!!!!!!!!!

[@paulox501]

you save my life after a math presentation thank you very much

[@AvalancheGameArt]

Your explaination helped me coding a local rotation of vectors.. Nice

[@allisonz7929]

My teacher never taught me this, and I needed to know it for the PARCC! This helped so much! Thank you :-)

[@floppitommi123]

Thanks, your video is simple yet explains the best.

[@breakfastattracys_]

Thanks so much, just made things a whole lot clearer

[@sahilpatel7185]

Thank you so much... saved my grade!

[@omgwow5670]

Thank you, This video helped me pass an important test!

[@Lina-bd1io]

thank you. you just saved me a lifetime of confusion

[@geoffbradley8783]

Thank you so much!! I was so confused by this concept at first but this video helped me alot!

[@coreyvannguyen]

omg this helped soo much!! you made the explanation very simple and easy to understand :) thank you heather

[@diptimistry5686]

Awesome Video! This really really helps! Thank You!

[@andrewnielsen556]

I wish you were my teacher, thanks a million

[@amayakeaton3938]

Thank God for this video 🙏

[@48gtm3s2f]

This was an awesome video! Thank you very much!

[@xzhi495]

thnx helped for grade 9 math

[@justaregularguy4435]

Xzhi u a senior now?

[@missingabrain]

I'm learning this in 7th grade, things change

[@ยคŦเเค]

@@missingabrain im learning it in 8th

[@shitpostinginc7779]

@@ยคŦเเค same

[@laith8283]

@@ยคŦเเค I'm learning it in grade 9 as igcse

[@ernidarmawati3938]

omg thank u su much!!, u teach way better than my teacher!

[@Eng.HumamGhazal]

This was very helpful, thank you very much

[@zahmiyab2809]

Thank you so much😢, my teacher taught this lesson but I barely understood to. Thanks to you I understand ❤

[@mithimaria8963]

This was really helpful! Thank you so much!

[@kaelinpark3222]

THANK YOU THANK YOU THANK YOU! This helped so much!

[@siddharthjain5116]

thx a million, u saved my geo hw

[@mamacoffey2346]

Eric, you have to figure it it how much the counterclockwise direction is clockwise. So 90 degrees clockwise is the same as 270 degrees counterclockwise.

[@mehedimim3248]

learnt something new.... Thank You. :)

[@leonicooper4930]

this video just saved my ass

[@camrynb7690]

This saved my life right before my geometry test

[@roarkomilion713]

Thank you very much you saved my geo homework

[@danielg.5102]

Helped a bunch, thanks so much!

[@AliAftab1234]

Try and not write in yellow. It doesn't come out that clearly. Besides from that it was an amazing video. Thanks a mill!!

[@MsBritish2009]

Ali A www

[@StrawberryPie2470]

Youre a lifesaving genius

[@andrea-mf3xn]

Much more helpful than my math teacher 😃

[@nhaque7able]

is the same method used for finding 90 degree clockwise also?

[@gabbychery642]

Thank you so much for this video! Please make more! :)

[@kenanbakhishli7766]

Thank you!!!!

[@umethpeiris9448]

Thank You So Much!! You Saved A Child From A Hungry Math Test!!!!😂

[@quadimage9936]

you saved my math test today

[@sayandey4453]

yes now i dont fail thank you so much

[@raymondgutierrez8362]

makes alot of sence

[@kurtlathrop5635]

THANK YOU SO MUCH!!!! I GET IT NOW!!!!

[@arjunmalik2849]

THANK YOU SO MUCH

[@do._.daboss4828]

Thank you so much but how is 0-2 equal to a positive 2?

[@nicktuteja1620]

this is very helpful thank you

[@destiedwards]

what a queen🤠🤠

[@brendangarvey3547]

HOW DO U KNOW WHAT POINTS TO SUBTRACT???

[@mamacoffey2346]

You subtract whatever point you are rotating it around.

[@kelcymm2985]

Thank you so very much!

[@myragupta2364]

How do we find the center of origin if it's not given?

[@mamacoffey2346]

Myra Gupta it is always (0,0) unless it says otherwise.

[@Kpopfan432]

is there a specific rule that I could use to remember this for any fixed point?

[@mamacoffey2346]

+Kpopfan432 When you rotate 90 degrees counter clockwise, swap your x and y values and then change the sign of your NEW x value. When you rotate 180 degrees, change each of the signs (do not swap). When you rotate 270 degrees counter clockwise, swap your x and y values and then change the sign of your NEW y value.

[@TanvirulHaque971]

thanks a lot

[@markkockler2242]

Thanks

[@bellatimberlake1288]

LIFE SAVE THANK YOU SO MUCH

[@이인옥-o4c]

What about 270 degrees??

[@이인옥-o4c]

Nvm

[@reruka3479]

@@이인옥-o4c how do u do 270

[@kennedimarie_]

Thanks a lot 💗

[@tony8bitd697]

So understandable thank you!!

[@guidoemail146]

Cool stuff, nicely explained. May I ask what the graphical tool you are using is called?

[@mamacoffey2346]

Guido eMail I use software that comes with a Mimio tablet. I use it to put the information on the screen, write on the scree, and then record the screen.

[@BS99718]

Heather Coffey Do you always subtract the point you are rotating about? What if the rotation point is above your other points, do you add?

[@muzikodas3857]

what about if I would like to rotate any particular alpha degree?

[@mamacoffey2346]

Müzik Odası I am not sure how to unless you use a protractor.

[@waseemakhtar7541]

life saver..

[@jkovacs64]

what would be the formula for the first one?

[@jamesrockford2626]

great... How do you do this in 3D?

[@itsyani9316]

thanks

[@MiXDuDeZzTvSubhanZainBilal]

U saved me 5 mins before my gcse exam

[@Riya_866]

What if the coordinates are (0,1) , how to rotate it 180 degrees about the origin? Is the 0 going to be -0?

[@mamacoffey2346]

It will be (0, -1). There is no such thing as -0 so you technically cannot change that sign :)

[@Riya_866]

Thank you. Really helped a lot :D

[@taytaykarate81]

thank u!

[@soufleexg798]

positive rotation???

[@user-nr2uv1kw7c]

okay i just have a question. so i get how you would get the value if you were plotting it counter clockwise, but if it were clockwise would you just not re-add the point that you were plotting around after you had already flipped the x and y and the sign?

[@nicktuteja1620]

What is the rule for 270

[@ivanvosky]

do you know how to rotate 35 degreess

[@mamacoffey2346]

I am not about a rule for that. You could use a protractor but I do not know another way. Sorry!

[@ivanvosky]

fuck you bitch!!!

[@ivanvosky]

so sorry madam, my young brother said that we use the same computer. Thank you anyways for the help

[@gologspro8624]

Is it the same for clockwise rotation?

[@mamacoffey2346]

iiliyan rafiq the rules are given in CCW so you have to figure out what the CW rotation is in CCW and then everything else is the same after that. So if it says 90 CW, this is the same as 270 CCW so that is the rule you use.

[@baylynn757]

Does this work for single coordinates with a fixed point of rotation.

[@sk8russco]

So this would work with all degrees? such as 90, 180, 270 etc. ?

[@mamacoffey2346]

Yes.

[@syedasalwa2391]

Very helpful but how would we do it for counter clockwise rotation? Is it the same method???

[@mamacoffey2346]

Salwa Azam It is the same method, you just have to figure out which rule to use. Meaning 90 degrees counter clockwise is the same as 270 degrees clockwise.

[@ramzpala6881]

How are you supposed to rotate 90 degree clcokwise?

[@radrainbow101]

90 degrees clockwise is the same as 270 degrees counterclockwise

[@davidolsen1222]

90 degrees clockwise is the same as 630 degrees counterclockwise

[@DnBastard]

rotate -90

[@asharjaffery399]

Raima Islam by multiplying with matrix (0 1) (-1 0)

[@fisslewine1222]

Why does the same calculation used for a 90 rotation work for a 180 degree rotation without using an angular of rotation in the equation?

[@mamacoffey2346]

Fissle Wine I do not believe that they will work the same since they are different rules.

[@ImTryingHarder]

Thank you

[@isamfakhri]

Amazing, thanks

[@Theonlyjeryl]

Would you expect a reply 6 years later

[@guidoemail146]

Just noticed the name of the tool at the top of the window - sorry for the silly question, it's kind of early here ;-)

[@abdullahjaved3097]

U just made me pass my Cambridge exams

[@anil-lingala-11]

Does this work with any given points

[@mamacoffey2346]

Yes

[@shanks6190]

I'm *trying* to complete my math homework

[@ekmvids2750]

Will this method still work if you are rotating it about a point that's in the shape? Like with your example instead of rotating it about (2,-2) could you rotate it about point A and still use the same method?

[@mamacoffey2346]

Yes, it works for any point that you are rotating around.

[@ekmvids2750]

+Heather Coffey thank you!

[@jacobniemeyer3802]

Hey i was just wondering what all of the formulas for rotating are

[@esthervargas1558]

+Jacob Niemeyer The formulas for rotating are R90(x,y)=(-y,x) -y being the opposite of the origonal number R180(x,y)=(-x,-y) R270(x,y)= (y,-x) R-90(x,y)=(y,-x) this is when its going clockwise around the origin tese are all only for the origin. Hope it helped:)

[@Lamasani]

when you change x,y to -y,x does the first coordinate still be x

[@mamacoffey2346]

Let's say your original point is (2, 4) when you change it to (-y, x), the point becomes (-4, 2).

[@ericmillers9975]

How to u rotate clockwise

[@mangoesaredelicious4622]

do you happen to know the rules for a 270 rotation?

[@billnyetherussianspy2137]

This prevented me from going an hero on this subject :D

[@blaketomlinson3915]

/b/ro

[@continuingtocreate1488]

I'm confused about the subtraction of points. Why do you subtract the point when you're going to add it back again?

[@ndchristie]

+Tori The Crafter We translate the shapes according to the difference of the origin and the rotation point, aligning the point with the origin. (this is "subtracting the rotation point") We then rotate the shape around the now-aligned points, which we already know how to do. We then restore the original origin by translating the shapes exactly opposite to the way we did in the first step (this is "adding the rotation point") You're right to think that steps 1 and 3 cancel each other out -- they are supposed to! But this makes it __much__ easier to perform the rotation if we do this little alignment dance. Imagine you have red socks on, and want to change into green ones, but you already have shoes on. Well, it's a lot easier to change your socks if you take your shoes off, even if you put them on again as soon as you're done. This is similar in principle. It's possible to do this all in a single step, but the formula is hard to read and would take more than 8 minutes to explain ;).

[@mojnumia881]

so if I have (-4;1) when I rotate it, is it gonna be (1;4)??

[@mamacoffey2346]

+mojnu mia It depends on how much you are rotating. The example you gave above is rotating 90 degrees counter clockwise around the origin.

[@mojnumia881]

+Heather Coffey OK I get it now thank you

[@crispinkawana2750]

Good teaching except for the yellow color. If only a less brighter color was used.

[@jonahrangel2013]

What would we do if we had to rotate a triangle 150 degrees

[@asfandkhan6139]

This does work but it's really time consuming if you were to do this on a test.

[@Isabela-gy8sm]

Just do one point and turn your paper around to see where the other points should go.

[@hey6317]

Hi sorry to bother you but why would you subtract your coordinates by 2,-2 ?(where did you get those numbers)

[@mamacoffey2346]

You subtract the point that you are rotating around and then you will add the point back in.

[@hey6317]

Thank you!

[@vishwakat8743]

How do I rotate it clockwise??

[@offchan]

Apply minus to your angle.

[@shakarimdikesh7286]

There will be no difference in case of 180,but as regards 90 degrees clockwise,then shift the position of y and x and put -1 in front of x value.Hope it was helpful )

[@MrNTC96]

what if i want to rotate 11pi/6 rad's ?? how it would be?

[@inesmane7688]

How do you get those coordinate ! ! !

[@mamacoffey2346]

Ines Mane I know I am late on this but I just made them up.

[@jonahrangel2013]

What if our point of rotation is the origin (0,0)?

[@suraiyabintemostafiz7955]

Extremely helpful. But how to rotate clockwise

[@brianmora7070]

Suraiya Binte Mostafiz (x,y) to (y,-x)

[@jeagerkhangaming7901]

Whoo Hooooo, This worked!