Math question

[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

 

[S Freud]

mmmmm pi.

 

[Beattie]

uhh, you answered your own question...

 

[Epic Fail]

Leave the pie alone!

 

[darkxshade]

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

276.5m^2 = 1.45 Pecan pi's


You're welcome

 

[Crusty]

It means your answer should be in the form of constant * PI

 

[mesthead21]

I would just leave it so its 88*pi.

edit: yeah, what crusty said

 

[thescreensavers]

so its 88pim^2 or 88 M^2PI? or just plain 88PI

 

[mesthead21]

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

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

 

[Chronoshock]

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

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.

 

[dullard]

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

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).

 

[HardcoreRobot]

first schedule a meeting with pi to discuss its terms, then you will know

 

[TuxDave]

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

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.

 

[Jeff7]

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.

 

[Born2bwire]

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

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

 

[Fenixgoon]

Originally posted by: Born2bwire

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

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

: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"

 

[GodlessAstronomer]

Holy shit this is the sort of thing you learn in your very first year of algebra, before high school. Come on dude.

 

[DrPizza]

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.

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