The slant height of this cone is the length of the sides of the cone taken from vertex to the outer line of the circular base. It is denoted by ‘l’. The altitude of a right cone is the perpendicular line from the vertex to the centre of the base. It coincides with the axis of the cone and is represented by ‘h’. ✅To learn more about Mensuration, enroll in our full course now: infinitylearn.com/cbse-fullcourse?TH-cam&DME&D2eekM To watch more videos related to Geometry, click here: bit.ly/MiddleSchoolGeometryPart2
0:56 Shouldn't the points in the sector be A, O, and A, since the circle wraps around back to the same point? Wouldn't the sector A, O, B only be half of the lateral area of a cone
This helps me a lot. Thank you. I was restudying and the text book just summarized this whole thing in 4 lines. Jeez I spent 1 hours staring at those four lines before being saved by your video
Thanks for all that you do for us students especially those who don’t have access to good tutors or coachings / classes , your channel helped me regain my lost interest in studies and I have seen an improvement in my grades . Thank you so much . Unë të dua ❤️💋💯💖 Dashuri dhe respeckt nge Kosova 🇽🇰🇽🇰🇦🇱🇦🇱Studenti juaji i sinqertë Kosovar 🇽🇰🇽🇰🇦🇱🇦🇱🇪🇺🇪🇺 shüme dashuri dhe dashuri nge Kosova . 💛🧡💛♥️♥️
Thank you, very helpful explain of a cone. I needed the Theta simbol to solve and finally got what i wanted to get the shape of the surfaces. Thankful to you :)
Note that if you measure in _radians_ instead of degrees, theta = (arc length / arc radius) = (2*pi * r) / l, making it simpler to form the equation for lateral surface area and arrive at the answer. E.g: lateral surface area = 2pi * l^2 * (theta / full circle) = 2pi * l^2 * (2*pi*r/l radians) / (2*pi radians) = 2pi * l^2 * r/l = 2pi * l * r
@Reena - The Greek letter, θ, commonly used to represent an angular measurement/variable. Because trying to type letters outside your native keyboard is super annoying.
+Ritesh - NEVER UNIFORM, thank you for your question. These two videos will help you understand why: Length of an Arc - th-cam.com/video/v-ZV_jMumFE/w-d-xo.html Area of the Sector - th-cam.com/video/7f9_U85_YX4/w-d-xo.html
look at it as a fraction of the whole circle, imagine the angle theta is 90 degrees so it would become one quarter of the circle, or 180 degrees so it become 1/2 of the circle then calculate it. 90/360 or 180/360 or 30/360.
I just so confused about the curved surface area in another videos, but this video helped me a lot to understand it, thank u so much, rlly appreciate all of your efforts for this video.
AB are labeled such that the line segment AB forms a diameter across the base. Yet, arc AB forms a... full circle? ABA or BAB, maybe. But AB is only half a circle.
The label on the video is incorrect. Arc AB is half the circumference if AB is a diameter. What you meant to say is that the sector goes from point A around the circumference back to point A, An animation showing the unwrapping of the cone would show that.
It's my pleasure. We are glad that you understood the concept. We are happy that we could help you learn. For more videos, please visit our website - dontmemorise.com/
You're most welcome Garry. We are glad that you understood the concept. We are happy that we could help you learn. Do support us by subscribing to our channel. 👍👍
India can top each and every event which is held on world 🌎, when the political situation is meant for development not for profit. Those Indians want this kindly like, this would promote my thought as well as our country
I like that each and every term is clearly explain. While explaining red colour marker used was good means student can easily understand the parts. step wise and diagrammatical representation helps to long term effect on memorisation. Handwriting shown in video is appropriate.Nice video to clear concept how to calculate curved surface area and length of arc.
Annotations are wrong in one of the two figures.... A-B forms semicircular perimeter of cone's base circle so length of AB (in 2nd figure) should be πr. OR opening whole curve surface it will be Arc A-A
The slant height of this cone is the length of the sides of the cone taken from vertex to the outer line of the circular base. It is denoted by ‘l’.
The altitude of a right cone is the perpendicular line from the vertex to the centre of the base. It coincides with the axis of the cone and is represented by ‘h’.
✅To learn more about Mensuration, enroll in our full course now: infinitylearn.com/cbse-fullcourse?TH-cam&DME&D2eekM
To watch more videos related to Geometry, click here: bit.ly/MiddleSchoolGeometryPart2
0:56 Shouldn't the points in the sector be A, O, and A, since the circle wraps around back to the same point? Wouldn't the sector A, O, B only be half of the lateral area of a cone
This is why I love India. The people there are so smart.
@Minchangas says the person with no life
@Minchangas Woah there buddy, that's very stereotypical. Maybe you should watch what you say.
@Minchangas I am referring to the no - life as having most free time on the world . Sorry I commented late cuz I have a "life" unlike you.
@Minchangas I am busy cuz I work hard and I don't understand how being indian makes you scammer anyways being scammer is better than being racist
@Minchangas I do extra work and I top in exams so check your facts
This helps me a lot. Thank you. I was restudying and the text book just summarized this whole thing in 4 lines. Jeez I spent 1 hours staring at those four lines before being saved by your video
Our teacher is very good in explaining I came here just to revise for exam✨
Thanks for all that you do for us students especially those who don’t have access to good tutors or coachings / classes , your channel helped me regain my lost interest in studies and I have seen an improvement in my grades . Thank you so much . Unë të dua ❤️💋💯💖 Dashuri dhe respeckt nge Kosova 🇽🇰🇽🇰🇦🇱🇦🇱Studenti juaji i sinqertë Kosovar 🇽🇰🇽🇰🇦🇱🇦🇱🇪🇺🇪🇺 shüme dashuri dhe dashuri nge Kosova . 💛🧡💛♥️♥️
Are you a musician???
As an Indian, I feel proud that my country people are smart. Very easy to understand. Thank you.
I wish if the teachers of my school could explain so well..
Your right
Yes
sure sis...
Okk
That is the situation, even teachers are not efficient. Their base is so weak yet they bribe and get the job. 😂 Corruption. 👍🏻
Misha amane
This video makes my doubts crystal clear thanks for the video
I love your work
Glad you liked it, Ishitwa.
Please subscribe to our channel: bit.ly/DontMemoriseTH-cam
Happy Learning :)
@@InfinityLearn_NEET "i shit wa"
Thank you, very helpful explain of a cone. I needed the Theta simbol to solve and finally got what i wanted to get the shape of the surfaces. Thankful to you :)
Wondering skill to make the students understand..... thank you for the explanation
I'm really happy to have access to such videos, please continue and don't stop
I hate memorizing formulas, that's why I like this channel
Very easy teaching and simple to complex formula are use ....very help full ...Thank you ...
Thank you for providing these type of videos.
Got it in 3 minutes which I was not getting in 2hour videos.Appreciable.
Whenever I look for a profound understanding of a concept, *Don't Memorize* comes into play. Thanks so much :)
Where are people like you?
Why don't we have such teachers at our schools ?
:(
it's soo good. it was very clear!
Thank you so much for your appreciation. We are glad that you understood the concept. You motivate us to do better. Keep watching our videos. 😊😊
Thanks 😊
India is full of intelligent people
45 minutes of class that I didn't understand learnt in 4 minutes. many thanks
It's wonderful.... u made this complex derivation simple by ur explanation thanku😊
Note that if you measure in _radians_ instead of degrees, theta = (arc length / arc radius) = (2*pi * r) / l, making it simpler to form the equation for lateral surface area and arrive at the answer.
E.g: lateral surface area = 2pi * l^2 * (theta / full circle)
= 2pi * l^2 * (2*pi*r/l radians) / (2*pi radians)
= 2pi * l^2 * r/l
= 2pi * l * r
@Reena - The Greek letter, θ, commonly used to represent an angular measurement/variable.
Because trying to type letters outside your native keyboard is super annoying.
Excellent teaching, I solve my query about 99%. Thanks
I think there is magic in your video. It cleared all my doubts. Thank you so much. ☺☺☺☺☺📙📙📙
🙂🙂
💜💜💜💜ARMY!!! Yeeeey💙
@@bijaykumarswain6096 🙂🙂
Best maths learning channel
Thank you so much for this video! It really helped me understand HOW the formula works! Thanks again!
Ma'am your teaching is greatly enhancing the present generation and guiding it to a great explicity .
Thank u.Its to simple to get understand by this video
I'm glad to hear that.
Please subscribe and press the bell icon to never miss a video: bit.ly/DontMemoriseTH-cam
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@@InfinityLearn_NEET already subscribed ur channel sis or brother!
Thanks for the video,
This video is indeed helpful for
Your videos are osm
Thanks beautiful explanation
I love it easy to understand and very useful in the exams
I DIDN'T GOT WHY YOU DIVIDED THETA BY 360, can u explain it to me?
+Ritesh - NEVER UNIFORM, thank you for your question. These two videos will help you understand why:
Length of an Arc - th-cam.com/video/v-ZV_jMumFE/w-d-xo.html
Area of the Sector - th-cam.com/video/7f9_U85_YX4/w-d-xo.html
look at it as a fraction of the whole circle, imagine the angle theta is 90 degrees so it would become one quarter of the circle, or 180 degrees so it become 1/2 of the circle then calculate it. 90/360 or 180/360 or 30/360.
i have a self-teach project on geometry and almost cried when i found this video thank you so much!!
+Anh Thu Nguyen Do , you're most welcome! You'll find more videos for free here: dontmemorise.com/course/view.php?id=60
Do let us know if it helped :)
omg yes thank you!
your videos seems so underrated though :/
it really help newbies like myself so i feel like it should be appreciated more
Thank you for the kind words Anh Thu Nguyen Do! Don't worry, with time, people will start appreciating it more :)
This channel is awesome and gives best practical teaching.
I just so confused about the curved surface area in another videos, but this video helped me a lot to understand it, thank u so much, rlly appreciate all of your efforts for this video.
Well explained
AB are labeled such that the line segment AB forms a diameter across the base. Yet, arc AB forms a... full circle? ABA or BAB, maybe. But AB is only half a circle.
its very interesting
anybody can understand tjis topis
Thanks Kriti! Have you subscribed to our TH-cam channel?
:)
Thanks
You're welcome!
Very much thanks
Woww..nice explanation.
Wow that's really great explanation.
Thank you do much for these videos
Wow..very easy to understand
Nice work don't memories
Beautiful
The label on the video is incorrect. Arc AB is half the circumference if AB is a diameter. What you meant to say is that the sector goes from point A around the circumference back to point A, An animation showing the unwrapping of the cone would show that.
Am very interested in this...
Amazing.
That's what I wanted! Thanks!
I subscribed for this video
Thank you so much! Finally got it!
this video helped me a lot!! thank you ma'am
It's my pleasure. We are glad that you understood the concept. We are happy that we could help you learn. For more videos, please visit our website - dontmemorise.com/
Amazing explanation
Simple english is used to make it easier, very nice....😊
Thank you, Diksha!
Keep watching! 🙂🙂
Best explanation I have ever seen. This video justifies the title of this channel. Hilarious!
i have no words for ur amazing vds
Quite awesome! It worths something more than thanks.
thnx a lot... really helpful
Very good
This is very helpful 😊😁😀😀
Thanks a lot
Lot of a thanks.this video is very helpful to understand the concept.
You're welcome!
Please subscribe and press the bell icon to never miss a video: bit.ly/DontMemoriseTH-cam
Happy Learning :)
Oh wow thanks now I know the formula
You're most welcome Garry. We are glad that you understood the concept. We are happy that we could help you learn. Do support us by subscribing to our channel. 👍👍
thanks thanks thanks u r great u r great u r great u r great completely spb ma fida ho don't memorise par
Hi
Nicely Explained... thanx
Thank you so much for making this video, it was really very easy to understand
The vedio on top of you is so complicated, but you aren't
Thanks
Excellent explanation, very nice👌
Thank you very much for the appreciation and for watching Dipika. :)
Is cone a polyhedron or not
It should be AA' instead of AB. Because AB is the diameter, OAB is only half of the curved face.
Good job Yuning!
thank u mam
I love this channel ❤❤
♾ X claps 👏 for this amazing explanation 🙂😀
Very very helpful
Thank you so much, Just for knowledge! We are glad you liked the video. Keep watching!! 😃
Bahut aachha
super good
India can top each and every event which is held on world 🌎, when the political situation is meant for development not for profit. Those Indians want this kindly like, this would promote my thought as well as our country
Thx
i never liked memorizing math
you are helping
Day after tomorrow is my maths exam and I am watching your video it really helped me lot.
In Lock down
Great channel available on TH-cam
Thank you very much for the appreciation and for watching Sandeep. :)
Thanks a lot
Thanks di for make this class interested😀
Most welcome Riya. 😊 We are glad that you understood the concept. Do support us by subscribing to our channel. 👍👍
Many many thanks mam
Great
Muito obrigado,ajudou muito!
Hi Ravy, de nada! Desfrutar de nossos videos :)
I didn't understand 😂😂😅😂😅😂😅😂😅
@@aditisaharan7396 me too
@@aditisaharan7396he said that "thank you very much it helped a lot "and than the reply is "hi Ravi you're welcome enjoy our videos "
Thanks a lot for the video
Really helped me boost my math grade
Am gonna ace my test now
We are glad that our videos were a help for you😊 All the best for your test👍For more videos, stay tuned to our channel😁
Happy learning :)
THANK YOU MAM
Thank you so much.
Happy Learning :)
Thankss
I like that each and every term is clearly explain. While explaining red colour marker used was good means student can easily understand the parts.
step wise and diagrammatical representation helps to long term effect on memorisation. Handwriting shown in video is appropriate.Nice video to clear concept how to calculate curved surface area and length of arc.
Annotations are wrong in one of the two figures....
A-B forms semicircular perimeter of cone's base circle so length of AB (in 2nd figure) should be πr.
OR
opening whole curve surface it will be Arc A-A
thats right
We Want a video on frustum too
NICE
How to find cost, while give, number of a thing and its surface area?
Please reply
By which app you make these vedio pleas tell me
Well done, excellent and clear explanation.
it helped me a lot........
Nice
Mam please make a video on frustum...
Thank you..
Surface area= pie x radius x slant height + pie x radius square(r2) this is way more easier than the one in the video.
s why i dont know they did this much calculation the logical way is so easy as u have said
Excellent Teaching
Born to teach ....
We're humbled to hear that! Thank you :)
Thanks 😍
You're most welcome Monika. We are glad that you understood the concept. For more videos, please visit our website - dontmemorise.com/
Wlcm i am big fan of u🥰
Next time could you make a question with answers??. It would really be helpfull. Hope you are seeing this comment