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Thanks for the help =)

- Thread starter Integral0
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- #1

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Thanks for the help =)

- #2

HallsofIvy

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- #3

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not according to my math book.

- #4

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it should be: A=2rπhA = 2 pi rh x 2 pi r^2

It would be pretty ridiculous if your math book called lateral surface area, "surface area" because no one will know what the heck you mean if you call it that.

-HBar

- #5

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What does n represent in your areas?

- #6

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It isn't N it is pi, done like this, & pi ; (minus the spaces) go back to General math, (the thread listing) and at the top you too can find "making math symbols" πOriginally posted by Integral0

What does n represent in your areas?

- #7

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According to my SAT math book ->

"The surface area, A, of the side of the cylinder is the circumference of the circular base times the height: A = 2nrh. The area of the top and bottom are each nr^2, so the total area of a can is given by the formula A = 2nrh + 2nr^2"

So if you are eager to refute this, go right ahead! I am not mad or attempting to fight your opinions, instead, I am trying to see who is right and who is wrong . . . so -> I can do the problems right!

So plz, tell me what's wrong with the statement above . . . its exactly what the book says about total area and surface area.

If the author is wrong . . . talk to Sharon Weiner Green and Ira K. Wolf from Barron's.

- #8

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I just noticed from HBAR a mistake that I had made when typing in the total area (I didn't mean to multiply 2nrh

Thanks HBAR

- #9

Hurkyl

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Emphasis mine.The surface area, A, ofthe side ofthe cylinder ...

- #10

HallsofIvy

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No, this is completely correct, but it is NOT what you initially said. You said " For example, the surface area of a cylinder is A = 2 pi rh while the total area of a cylinder is A = 2 pi rh x 2 pi r^2."The surface area, A, of the side of the cylinder is the circumference of the circular base times the height: A = 2nrh. The area of the top and bottom are each nr^2, so the total area of a can is given by the formula A = 2nrh + 2nr^2"

Your book says "the surface area of the SIDE of the cylinder" which is not the same as the "surface area of a cylinder".

(Sorry, Hurkyl, I just noticed you had already said this.)

Before you complain about your textbook, read it CAREFULLY.

Mathematics is very, very precise.

(I have friends who remark on how "anal" mathematicians are. Of course,they are generalizing from a very small sample!)

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- #12

russ_watters

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How many sides on a cube?Originally posted by quantum

...the four sides of the cube.

Sorry, couldn't let it go following a post about how precise math is/has to be.

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selfAdjoint

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