Question

How would u get rid of the pi in this equation:
25pi(r)(r+2pi(r)^2

Answer 1

it should be equal to something
?

Answer 2

all this equals the surface area of a given cylinder

Answer 3

can u type r without brackets and only use where neceessary

Answer 4

okay, the original was .
S=2pir(r+25/pir^2)

Answer 5

pi is getting cancells directly as one pi is in Numerator and other is in denominator!!

Answer 6

ooo k. i see that. but for the answer they have 2pir^2+50r^-1. they brought up the pir^2 from the denominator to make 2pir(r+25pir^-2)

Answer 7

u need to type the question correctly earlier u typed it differently please upload the questionor attach file

Answer 8

Originially It yped it this way, i see now that as a typo I wrote 2pir^-2 instead of 25.

The Original : S= 2pir(r+25/pir^2)
They simplified it so that now it's S= 2pir^2+50r^-1
I understand the 2pir was distributed nto in the parenthesis, but I do not understand why the pi was cancelled in the simplified version.

Answer 9

\[ S= 2r \pi(r+ \frac{ 25 }{ \pi^2 })\] Is this the correct version?
If so, then
\[ S= (2r \pi)r + (2r \pi)(\frac{ 25 }{ \pi^2 })\]
notice that the pi will cancel at the back, leaving, \[S=2\pi r ^2 + \frac{ 50r }{ \pi}\]

Answer 10

its just simple multiplication results in cancellation of pi!!

Answer 11

ok, thank you

Answer 12

You're welcome!