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.
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
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.
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).
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.
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
@@MathematicsTutor I want to ask 2πr is the circumference of whole circle, so lenght of the sector should be 2 πr( angle between both L)/360°. Plg clear this. I am still confused