Acarpenter2
  • Acarpenter2
For the surface area of a rectangular prism do i have to double it because its a 3D shape? For example if the length of it is 12, the width 8 and the height 6. would the equation look like this: A= 2(8*12+6*12+6*8)? or would it look different.
Mathematics
schrodinger
  • schrodinger
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sloppycanada
  • sloppycanada
So once you find the area of one side of the rectangle, multiply it by four. Then find the area of the sides. |dw:1435756930736:dw|
sloppycanada
  • sloppycanada
So there are four x's that should be the same side of this is a rectangle. How would you solve for the y's.
Acarpenter2
  • Acarpenter2
I'm not trying to solve for y's i just wanted to know how to find the surface area of a 3D shape. also what if it didn't have a top?

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sloppycanada
  • sloppycanada
The surface area of something is every single side. since it's a 3D shape, it has... 6 faces. Hence why you need to find out what "y" equals in order to find the surface area of something. If it didn't have the top I don't think it'd be considered a 3D shape.
Acarpenter2
  • Acarpenter2
@sloppycanada buckets don't have tops does that mean there not 3D...... honestly think before you type.
sloppycanada
  • sloppycanada
Yes, but they have bottoms... in which case, you'd still have to find the surface area of the bottom of the pail.
Acarpenter2
  • Acarpenter2
but so does the rectangular prism! it has a bottom and a top
sloppycanada
  • sloppycanada
|dw:1435764803251:dw| How many faces does this have?
Acarpenter2
  • Acarpenter2
7 the 6 front sides and the inside
Acarpenter2
  • Acarpenter2
6 outsides not front sides
sloppycanada
  • sloppycanada
No, we don't care about the inside. Pick up a box, a good ol' cardboard box. How many faces will that have when you prop it up?

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