Surface Area of a Cone Formula Derivation Concept with Visual Easy Approach 

I can't thank you enough for this. When you study for yourself, you learn to memorize some simple formulas and never really question where they come from, but now that I have to explain math to other students I find that there is a mountain of stuff I didn't know about math and geometry.

Time has got nothing on this video. Very well explained.100 years from now ,it would still be useful to generations to come.

Thanks a lot sir! So kind of you to go into needed details!

Sir u r very expert sir

Excellent explanation of curve surface area of right angle circular cone

Except for the early portion of the autofocus (and I almost moved away), I think this is one of the best educational video. Making sure we follow every step perfectly. Bravo

nice explanation sir i watched many videos to derive cone csa this is the best thank you very much nice voice also

The best ever explanation! thanks for sharing!

Amazing' lecture

Thanks to this explanation i got an A in math.Thank you very muchh.

Thank you sir, your explanation is great.

Great work👏

beautiful way to visualize...thanks a lot

Thanks

My teachers completely overlooked this, thank you so much.

That's really good

Thanks sir it was good 👍

I've looked at a few proofs for this and this was the simplest and most elegant

Really nice class sir

Great!

Thank you for the great explanation. The pacing was perfect. This is such a difficult thing to visualize as one part depends on your knowledge of another mathematical concept.

Great explanation sir

Thank you for your help. I’m so glad to find out this amazing video. Your explanation was perfect! Thank you again 🙏

Slow and easy, great work! Nice video

Turn autofocus off, and set the focus automatically so it doesnt drop out of focus :)

We can simply find area by simple sector area formula like 2πl(theta/360°)= 2πr....(1) πl²(theta/360°)= Curved surface Area of cone And now substituting the value of (theta/360°) that we got from equation 1 now we get formula (πrl).

Couldn't find any video on this only the formula, but I couldn't settle without knowing where they came up with the multiplier.

Very good explanation thankyou sir it helped me a lot, you are a genius

This make my doubt clear .thanks very much sir.Bring more such type of vedio .

Except for the autofocus problems early on, nice geometric treatment of the lateral surface (+/- the base) area of a cone. Presentation also hints at a Riemann sum/integral as a solution for those who are interested.

very nice explanation

Best explaination so far. I think we can do the same technique of yours to also determine area of circle itself. πr^2

Very nice

that was helpful 👍🏼👍🏼tysm

Thank you for the derivation. It was very nice.

The best xplanation ever... Fr dis derivation

sir literally op sir u r great

Thanks for telling such a simple way ❤️

Why to make it so difficult sir Area of a sector= pi * r^2 * (length of arc/(2*pi*r)) In his case Radius r is l Length of arc is 2*pi*r So =pi*l^2*(2*pi*r/(2*pi*l)) = pi*r*l

Nice derivation without the use of integral calculus....✔

bhut acche se smajh aaya...

Really ,,it was a great explanation ......

Thank you sir

Why did you draw it like a parallelogram? Should have drawn it as a rectangle from the get go. Other than that, great vid!

I would’ve never thought of that.

Beautiful. Don't know why I couldn't figure out why the cone portion wouldn't be Circumference * Slant but you broke it down amazingly.

Thanku sir

Excellent pacing, but the focus kept shifting, and your r's look like v's!

Thank you Sir for such a good stuff

What is the blurr in middle of the very video

How is the area of trapezium the slant height and product of base length

Turn autofocus off pls

Problem of camera.

Video is not clear

Keep your camera straight

Volume sir

2πr is the circumference of whole circle, how can you take 2πr in case of sector

So basically calculus

Improve your vedio quality

Its too blur to understand

Saal bhar ki bana leta video

Blurry thing in the video is causing distractions. Can’t watch for even a minute.

Blurring is distracting. Not watch even 1 min

waste

WORST EXPLANATION..

Thanks

Thank you sir

thanks