✅ Thanks so much for watching! ✌️✌️✌️ ✅ One quick note about the step where the radius and slant height are plugged into the formula... I do not have an "x" to represent multiplication in between π and 4 squared for the area of the base like I do for the lateral area (πx4x13). This is okay because π next to a number means to multiply.
Thank you! I have a math test tomorrow and wanted to know how to do this just in case. It was way easier than I thought, all I have to do is remember the formula.
Idk if he posted a video on it, but the surface area of a sphere is 4πr². Basically, the circle they draw in the middle of a sphere, you just find the area of that circle and multiply it by 4, hope that helps if you still needed it
Instead of unravelling the cone you could just take length( which is the square root of height squared plus radius squared ) and make that the upper bound , then along that length you can get each height if you calculate the angle. So the integral will be xsin(angle) from 0-L , then multiplied by 2pi and added to area of base.
✅ Thanks so much for watching! ✌️✌️✌️
✅ One quick note about the step where the radius and slant height are plugged into the formula... I do not have an "x" to represent multiplication in between π and 4 squared for the area of the base like I do for the lateral area (πx4x13). This is okay because π next to a number means to multiply.
Its crazy how he can teach better than any teachers in 5 mins or less
It took my math teacher a hole week and I didn’t understand it and a random guy on TH-cam expanded it and I understand it
Whole
😂
Thank you so much Mr J
Sir I am a student from India, Thank you for the video
I am also from india
I am also from India and a Teacher of Maths :)
I am in America and am learning math
How is being from India have to do with anything
No one asked you to respond
THANKS FOR SAVING MY LIFE
Thank you! I have a math test tomorrow and wanted to know how to do this just in case. It was way easier than I thought, all I have to do is remember the formula.
agreed
just remember to write the formula when u do a question
I do it every time cuz it drills the formula into ur head it makes it easier fr
Well test is easy BUT I HAVE AN OCTOBER EXAM NAUR
Same!
You helped me a lot with my exams, you deserve more likes sir
Glad to hear that!
True
Yes
I agree 💯 percent
He's teaching more then my teacher
thank you sir 🎉🎉🎉🎉🎉
thank you this helps a lot to me
Sir Thank you for the lesson this is really helpful for me
Best math channel on TH-cam
yes the best!
Thanks so much!
tysm mr j you are a LIFE SAVER
Omg i have a test todayy hopefully i can remember thjs
Thank you so much for teaching me!! Now I’m ready for my math final! 👍😄
Thanks, my teacher taut us a really complicated way where you have to find the angle area so it was really complicated
Thank you soooo much I have such a hard time with geometry you made it seem so much easier
I needed this for my grade 8 exam thanks
Teacher I came from Rwanda thanks ❤
This was a very nicely done video, keep it up :)
Thank you for this!! I needed this because my final exams are so close,this helped a lot!
Thanks I have my HSAT on Wednesday and I was reviewing and this really helped
Iam student from India and I thank you for a clear explanation
W teacher.
my teacher took 3 days of complicated classwork and lectures just to learn the same thing but better in 5 mins
Thank sir!
thanks a lot it will help in my end of year assessment
Thank you mr i am a student from papua new guinea ❤
Hey Mr. J! Can you please post a video about the surface area of sphere? Thanks so much for helping meeee ❤😊
Idk if he posted a video on it, but the surface area of a sphere is 4πr². Basically, the circle they draw in the middle of a sphere, you just find the area of that circle and multiply it by 4, hope that helps if you still needed it
@@Child_of_God_23 oh yeah. Thanks for helping :)
dude this helped me not fail my maths exam. thanks, what a nice guy
i'm kidding but still a great vid man
@@cooperdorta5119 bro 💀
Great information for the surface area
It really helped !
Btw when is your face reveal ?😀
I think his bitmoji IS his face reveal.
@@dipikaanand6769 ha ha😂
Thanks 😊
Wow this really helped thanks so much
Is this for in and out what will the calculation be for inside and outside or is it times 2
W teacher now I can ace my test❤
Can you plz make a vid about profit and loss
Say I agree if you think Mr J has a brain of mathematics and very smart well I agree
Instead of unravelling the cone you could just take length( which is the square root of height squared plus radius squared ) and make that the upper bound , then along that length you can get each height if you calculate the angle. So the integral will be xsin(angle) from 0-L , then multiplied by 2pi and added to area of base.
Politely, I think formulas like these is why mr j makes such videos...
Can you do a video for more explanation?
Nicely done. One improvement would be to write what 's' represents on the cone.
Dude your a big help you were better than chatgpt
im only watching these for the fomulas but thank you
❤❤ thanks so much
My God bless you! 😮
Thank you this really helped my fear of middle school
Thank you so much ! Idk why my maths reader made the steps way more complicated than it should
Exactly
Please sir what's the difference btwn surface area and area coz am working on finding the area
You would use the area on a 2d shape and you would use surface area on 3d shape. Hope this helped
and realy nice videos it help everyone
How is the Pi r l part derived?
sir i want to know how did you get the answer 213.63? can you explain it for me? did it will round off to the nearest hundredths 214 or not?
What do we do if we only have the height and radius
Quick math question how many hundreds go in the number of subscribers Mr J has
Hey are you sure your final answer is right cuz 68x3.14 is 213.52
Yeah, but he used the "not rounded" version of pi which is 3.1416 which gives you 213.6288 or 213.63
@@monale5637ohok
Surface area of spehere next?
SA of Sphere... very easy :)
Flexing
What happens instead of a radius its a diameter
I want to find S if L is unreliable how?
I hate school in Canada 😭
Why is that, as a Teacher myself teaching with many Canadian Teachers, im curious !
mee too
3.14 × radius × (h+r)
Math test in 5 mins thank you
Isn’t it summer tho?
🤣🤣🤣🤣
No some ppl still have school
@@diluc1556 ya I'm doing homeschool so i might have summer homeschool :(
First!
N8ce
Hm. Two people first. Thats nice.
bruh
3.14×68=213.52
I'm in 4th grade i know area and perimeter
I almost 4th
And? I'm in 5th grade but is doing 7th grade math right now.
Also the area and perimeter of which 2d shape?
Ayyo im in 5 but doin 7 grade math tooo
Im in 6th grade
thx a lot even tho im 3 years late
Please correct me if I were wrong, but I think the answer is 213.52 . . .
The lateral area is a shape of a slice of pizza
My test is tomorrow 💀 its 12:48 am Rn
Did you pass your test?
@@Cal32_ I did 😭
Wow great! was it hard?
i think he multiply 68* 3.14159
sir please help with sum You and 5 friends saved money for 2 years to go to the Kruger National Park.
Mr.J I think I have a crush on you
AYO🤨🤨🤨🤨
🤔
Anything I do but I still don't understand my FUCKING lessons
Don't understand
When you said "PI rs", I thought you said IRS. 💀💀
😂
Free Palastine!❤🇵🇸
Hindi ko gets😢
Thank you so much!!