Optimization Problems Involving Cylinders

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At 3:07 you times out “r” to remove the bracket however why does the denominator not become 2r? great video!

savannasmith
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9x3/2 is 27/2. not 6.

9x 2/3 is 6.

root13.5/pi= ~2


I got r to be 2.07 and h to be 0.43.

which makes sense when substituted back to the surface equation, it equals 18.

ZebecZT
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isnt the surface area 2pir2 + 2pirh????

amna