Surface Area of Spheres (1 of 2: Finding the Surface area of spheres and hemispheres)

[manjistharawat]

You've made it not only understandable but enjoyable too! Thank you, Sir!!

[papilionig]

can't thank you enough!! no every teacher is as competent in teaching like you. love it!!!

[kbailkeri]

finally someone who explalins how the formula makes sense. Thanks a lot sir!

[HoshikawaHikari]

Now I understand, thank you! (My teacher never explains in detail like you do)

[oitheremate]

You are marvelous sir. Just like Ramanujan. I like the way you teach, its fabulous. I want to know where did you study from and in which country do you teach mathematics, and importantly are you really a school teacher?
Hope you will reply.
Thank you

[christopherellis]

Great Circles, the key to competent navigation! Passing through opposite points of the surface. It don't mean a thing, if it got that spin...because there is some interesting physics that happen on the surface of a rotating sphere.

[KamuStoku]

When looked to an hemisphere on top you can see it like a circle so it must be 2πr^2 a sphere`s surface area. Isnt it?

[RexCorpuscle]

Hey what's wrong with the antarctic circle? You're an Australian!

[auckcouncil]

So why don't you simplify it? Use the diameter. A= pi times D squared. Much easier.

[greatsky]

Using the integral by thinking, it's easier:
surface = 2 * integral { [ 2 * pi * (R^2 - z^2)^0.5 ] dz | (0, R) }

[ViMi]

2:50 theory and practice are two completely different things :) :)

[prabinlimbu]

Lucky students who could sit in his classes

[ХасанГулам]

Hello, please can you explain how to convert the surface area of the sphere to the area of rectangular

[angel_ia]

Due to abandoned tiny curved areas, the real magnitude must be MORE than "12.56".