Volume of a Sphere | MathHelp.com

This lesson covers the volume of a sphere. Students learn that the formula for the volume of a cylinder is pi times radius squared times height, so the volume of a cylinder that has a radius of 10 feet and a height of 40 feet is pi times 10 squared times 40, or pi times 100 times 40, or 4000 pi cubic feet. And since pi = 3.14, 4000 pi cubic feet can also be written as 4000 times 3.14, or 12,560 cubic feet. Students also learn that the formula for the volume of a sphere is 4/3 times pi times radius cubed, and the formula for the volume of a cone is 1/3 times pi times radius squared times height.

[wormss]

When your teacher doesn’t explain your work well so you use this random lady you found off the internet to help you with your work.

[jamesmalis]

Can we just acknowledge how neat her handwriting is 🙃😉 🔥

[valentinahernandez]

I feel bad for her because people are making fun of her smile. Let her smile. She's doing her job.

[chasebilliot]

Who else is stuck trynna figure this out during corona

[_dominate_]

her- exists
me- just trying to figure out how to cross cancel

[kylauren]

OHH GUYS I FIGURED OUT WHAT SHE MEANS BY CROSSED ITS ONE-THIRD OF THE NUMBER!!! IT SAYS IT IN THE I hope this helped u guys heh.

[jackboltsvolts]

Thanks a lot for whispering the formula to me, with that great smile! After being 40 years away from high school. Nice refreshment to my memory!

[smileplease]

Nobody :
YouTube recommending video after 4 years : you might have forgotten the volume of sphere

[saqibchauhan]

She the reason I’m even close to passing my geometry class

[strawberrymocha]

When she cross canceled the 27 into 9 and the 3 into 1. It was just a simpler way to do 4/3 times 27/1. For 4/3 times 27/1, 27 is a multiple of 3 so you can cross multiply and simply to 4/1 and 9/1. Leaving 9 times 4 which is 36. Then add the units. Hope this helped.

[hannin-wa]

This is really helpful, thank you very much. My book has the formula but didn't discuss what they did with the 4/3.

[skywinner]

I need more why did she turn the 27 to 9!!!

[broitsjryt]

Dam a 2 minute video thought me more than a 1 hour lesson

[ladunlayomi]

I just started watching these videos and her smile alone throws me of in a good way.

[unbotheredbaby]

How are you teaching me in a couple minutes but my teacher can’t In a couple days...

[i._.i]

for those who don't know how to cross cancel or cant do it with your given answer, just multiply the product pi and the radius cubed by four and then divide by three, after that you can proceed to multiply it by pi to get your final answer.

[emceeaye]

It might help to explain why the '4/3' is in there. That way, people won't blindly just use the formula without understanding why they are doing what they are doing.

[Justin-dxhf]

Y’all so basically you do take the R divide it by 3 and then take your answer from that and multiply it by 4 then just put the pie at the end

[rkprototype]

My online work is due in 2 hours, this video was very helpful, thanks

[haydenkeller]

the only video on the internet that helped me out on this. Thank you so