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Math question

thescreensavers

thescreensavers

Diamond Member
Fine the surface area of a cylinder in terms of Pi

wtf is "in terms of Pi"

Radius is 4m and hight is 7m

2(pi r^2) + (2 pi r)*h is the formula to find the surface area and I got 276.5m^2

Wolframalpha

but how do you find it in terms of Pi? google does not help me 🙁
 
Originally posted by: thescreensavers
Fine the surface area of a cylinder in terms of Pi

wtf is "in terms of Pi"

Radius is 4m and hight is 7m

2(pi r^2) + (2 pi r)*h is the formula to find the surface area and I got 276.5m^2

Wolframalpha

but how do you find it in terms of Pi? google does not help me 🙁
Click to expand...

276.5m^2 = 1.45 Pecan pi's


You're welcome
 
Originally posted by: thescreensavers
so its 88pim^2 or 88 M^2PI? or just plain 88PI
Click to expand...

thats the only thing that makes sense. You square the radius and multiply the radius x height. So your left with 32(pi)m^2+56(pi)m^2

also, it is the surface area, area is always a unit of measurement squared, like volume is a unit of measurement cubed
 
Originally posted by: thescreensavers
so its 88pim^2 or 88 M^2PI? or just plain 88PI
Click to expand...

Seriously?
Pi is a constant, it has no units. You are looking for an answer with units.
Don't treat pi like some mysterious quantity, it's just a symbol for a numerical value. How would you represent 40 meters squared in terms of @ where @ = 4? It would be 10*@ meters squared. Just because part of your quantity is a symbol doesn't make it magically appear on the other side of your units.
 
Originally posted by: thescreensavers
Fine the surface area of a cylinder in terms of Pi

wtf is "in terms of Pi"

Radius is 4m and hight is 7m

2(pi r^2) + (2 pi r)*h is the formula
Click to expand...
You answered your question. I bolded the answer. It really isn't that complicated. Of course, we can simplify it a bit.

Start with: 2(pi r^2) + (2 pi r)*h
Plug in r=4 m: 32 m^2 * pi + 8 m * pi * h
Plug in h=7 m: 32 m^2 * pi + 56 m^2 * pi
Factor out the pi: (32 m^2 + 56 m^2) * pi
Add up the two parts in parenthesis: (88 m^2) * pi

There it is, in terms of pi. What that means is DON'T plug in the value of pi. In other words, the teacher is trying to force you to do the math instead of plugging it into your calculator. Of course, the teacher doesn't know that calculators can now leave things in terms of pi (or any other symbol).

 
Originally posted by: thescreensavers
so its 88pim^2 or 88 M^2PI? or just plain 88PI
Click to expand...

m^2 is a unit so putting it in the middle doesn't make much sense. And having your answer unitless is like answering "How tall are you?" with "240"........ 240 WHAT.
 
x + y + z = 1

In terms of x:
x = 1 - y - z

In terms of z:
z = 1 - x - y


Figure out how to solve that in terms of y, and you'll know what you need to do for your problem.


 
Originally posted by: Born2bwire
Originally posted by: thescreensavers
so its 88pim^2 or 88 M^2PI? or just plain 88PI
Click to expand...

All I know is that when this baby gets up to 88 pi/hr, you're gonna see some serious shit.
Click to expand...

:laugh::thumbsup:

OP, in terms of "X" usually means

5x^2 + 10x + 7

in your case, you have terms that are linear with pi. it's the equivalent of saying

"6x + 10x + 2x + ..." and just simplifying to "18x"
 
Originally posted by: GodlessAstronomer
Holy shit this is the sort of thing you learn in your very first year of algebra, before high school. Come on dude.
Click to expand...

6th grade? When they get to me in 9th, they're supposed to be experts at it.
 
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