Maths?

• jlzk

  14 Jul 07, 01:00

  Whats the formula for a external surface of a tin ?
  Is there any other formulas that is vital to know for O and N lvl?Kindly make a list that you think that is so.Thanks.
• Darkness_hacker99

  14 Jul 07, 01:06

  External surface area of a tin.
  
  2 * pi * r * h
  
  Must find the circumference of the tin, this will be the length if you see it as a sheet.
  
  Then multiply by the height. This will give you the external surface area of the tin.
  
  
• Darkness_hacker99

  14 Jul 07, 01:15

  Please correct me if I am wrong.
  
  Internal surface area of a tin = External surface area of a tin.
• ditzy

  14 Jul 07, 01:17

  Originally posted by Darkness_hacker99:

  Please correct me if I am wrong.
  
  Internal surface area of a tin = External surface area of a tin.

  Then what if the tin has a thickness of t?
• ditzy

  14 Jul 07, 01:17

  Originally posted by Darkness_hacker99:

  External surface area of a tin.
  
  2 * pi * r * h
  
  Must find the circumference of the tin, this will be the length if you see it as a sheet.
  
  Then multiply by the height. This will give you the external surface area of the tin.
  
  

  How about the round surfaces on the top and bottom?
• jlzk

  14 Jul 07, 01:19

  Er...i though is 2(pie)(r)(h) +2 (pie)(r^2)
• Darkness_hacker99

  14 Jul 07, 01:19

  Originally posted by ditzy:

  How about the round surfaces on the top and bottom?

  plus another
  
  2 * pi * r^2
• Darkness_hacker99

  14 Jul 07, 01:21

  Originally posted by ditzy:

  Then what if the tin has a thickness of t?

  If got thickness best, can calculate more accurately.
  
  But TS question is quite general, haven't reach the industry level leh.
  
  
• ditzy

  14 Jul 07, 01:23

  Or it could be (h/4)(pi)(d^2) + (pi)(d^2)/2?
• Darkness_hacker99

  14 Jul 07, 01:24

  Originally posted by ditzy:

  Or it could be (h/4)(pi)(d^2) + (pi)(d^2)/2?

  
• ditzy

  14 Jul 07, 01:24

  Originally posted by Darkness_hacker99:

  If got thickness best, can calculate more accurately.
  
  But TS question is quite general, haven't reach the industry level leh.
  
  

  Normally when its indicated as tin, t is taken to be negligeble.