Let’s Find The Volume of the Cylinder – step-by-step….

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Woot! I remembered math from 20 years ago!!!

XXNerdzillaXX
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You often make simple stuff more complicated

MakindoLearning
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As a quick calculation on my building sites, it's, length x circumference x radius ÷ 2 = how much concrete to fill each cylinder.

kingdomfor
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Area of circle * height, so
(Pi*2^2)*8 =32pi sq ft

kennethwright
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D squared times Pi divided by 4 times the height. Pi divided by 4 = .7854. I use this when I a working with pipe figuring flow volumes. 1" diameter has an area of .7854. 2" diameter has an area of 3.1459. Etc.

Aereaux
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problem here the decimal approximation in my calculators if you multiply 32*pi = aprox 100.5309649
I see that you used exactly 3.14 for pi and it gave you 100.48 but that may confuse some students since almost everyone has a calculator or a phone now to do the you actually mentioned around 7:57 "if I go into my calculator" Just some constructive feedback....

jcjmz
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using pi will always be an approximation. never an exact answer

warrendewson
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Instant answer: Pi x R squared x height. 11 minutes to explain probably included the formula for the area of a circle. I didn't watch. Just wonder why these things take so long to explain.

markjohnson
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