Question

Find the area cut out of the cylinder x2+z2=49 by the cylinder x2+y2=49.

Answer 1

can you imagine how the common surface looks ?

Answer 2

just a small cylinder.

Answer 3

http://mathworld.wolfram.com/SteinmetzSolid.html

Answer 4

oh, ok.

Answer 5

there is a derivation for surface area in that link

Answer 6

i tried that. 16/3 *7^3 and it didn't work.

Answer 7

trty 16r^2

Answer 8

that didn't work either

Answer 9

i mean 16*7^2

Answer 10

what ever that evaluates to..

Answer 11

(16)*7^2

Answer 12

784. and that's not right.

Answer 13

try 392

Answer 14

yes.

Answer 15

did u get why it worked

Answer 16

half of that 784

Answer 17

yes but why half ?

Answer 18

not sure really

Answer 19

this closed surface has four faces/walls, yes ?
http://mathworld.wolfram.com/images/eps-gif/SteinmetzSolid2_501.gif

Answer 20

two opposite faces are formed by a cylinder

Answer 21

if you cut it with another cylinder2, you will get a closed surface but the cylinder2 touches cylinder1 only on two faces.. you will need to visualize in ur head

Answer 22

ok. i have another question on this homework i'm gonna post. might be a simple error of the way i'm writing it. thanks.